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单词 Digitaddition
释义

Digitaddition

Start with an Integer , known as the Generator. Add the Sum of theGenerator's digits to the Generator to obtain thedigitaddition . A number can have more than one Generator. If a number has noGenerator, it is called a Self Number. The sum of all numbers in adigitaddition series is given by the last term minus the first plus the sum of the Digits of the last.


If the digitaddition process is performed on to yield its digitaddition , on to yield , etc., asingle-digit number, known as the Digital Root of , is eventually obtained. The digital roots of the first fewintegers are 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 3, 4, 5, 6, 7, 9, 1, ... (Sloane's A010888).


If the process is generalized so that the th (instead of first) powers of the digits of a number are repeatedly added,a periodic sequence of numbers is eventually obtained for any given starting number . If the original number isequal to the sum of the th powers of its digits, it is called a Narcissistic Number. If the original number isthe smallest number in the eventually periodic sequence of numbers in the repeated -digitadditions, it is called aRecurring Digital Invariant. Both Narcissistic Numbers and RecurringDigital Invariants are relatively rare.


The only possible periods for repeated 2-digitadditions are 1 and 8, and the periods of the first few positive integers are 1,8, 8, 8, 8, 8, 1, 8, 8, 1, .... The possible periods for -digitadditions are summarized in the following table,together with digitadditions for the first few integers and the corresponding sequence numbers.

Sloanes-Digitadditions
2Sloane's A0311761, 81, 8, 8, 8, 8, 8, 1, 8, 8, 1, ...
3Sloane's A0311781, 2, 31, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 3, ...
4Sloane's A0311821, 2, 71, 7, 7, 7, 7, 7, 7, 7, 7, 1, 7, 1, 7, 7, ...
5Sloane's A0311861, 2, 4, 6, 10, 12, 22, 281, 12, 22, 4, 10, 22, 28, 10, 22, 1, ...
6Sloane's A0311951, 2, 3, 4, 10, 301, 10, 30, 30, 30, 10, 10, 10, 3, 1, 10, ...
7Sloane's A0312001, 2, 3, 6, 12, 14, 21, 27, 30, 56, 921, 92, 14, 30, 92, 56, 6, 92, 56, 1, 92, 27, ...
8Sloane's A0312111, 25, 1541, 25, 154, 154, 154, 154, 25, 154, 154, 1, 25, 154, 154, 1, ...
9Sloane's A0312121, 2, 3, 4, 8, 10, 19, 24, 28, 30, 80, 931, 30, 93, 1, 19, 80, 4, 30, 80, 1, 30, 93, 4, 10, ...
10Sloane's A0312131, 6, 7, 17, 81, 1231, 17, 123, 17, 17, 123, 123, 123, 123, 1, 17, 123, 17 ...


The numbers having period-1 2-digitaded sequences are also called Happy Numbers. The first fewnumbers having period -digitadditions are summarized in the following table, together with their sequence numbers.

SloaneMembers
21Sloane's A0077701, 7, 10, 13, 19, 23, 28, 31, 32, ...
28Sloane's A0311772, 3, 4, 5, 6, 8, 9, 11, 12, 14, 15, ...
31Sloane's A0311791, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, ...
32Sloane's A03118049, 94, 136, 163, 199, 244, 316, ...
33Sloane's A0311814, 13, 16, 22, 25, 28, 31, 40, 46, ...
41Sloane's A0311831, 10, 12, 17, 21, 46, 64, 71, 100, ...
42Sloane's A03118466, 127, 172, 217, 228, 271, 282, ...
47Sloane's A0311852, 3, 4, 5, 6, 7, 8, 9, 11, 13, 14, ...
51Sloane's A0311871, 10, 100, 145, 154, 247, 274, ...
52Sloane's A031188133, 139, 193, 199, 226, 262, ...
54Sloane's A0311894, 37, 40, 55, 73, 124, 142, ...
56Sloane's A03119016, 61, 106, 160, 601, 610, 778, ...
510Sloane's A0311915, 8, 17, 26, 35, 44, 47, 50, 53, ...
512Sloane's A0311922, 11, 14, 20, 23, 29, 32, 38, 41, ...
522Sloane's A0311933, 6, 9, 12, 15, 18, 21, 24, 27, ...
528Sloane's A0311947, 13, 19, 22, 25, 28, 31, 34, 43, ...
61Sloane's A0115571, 10, 100, 1000, 10000, 100000, ...
62Sloane's A0313573468, 3486, 3648, 3684, 3846, ...
63Sloane's A0311969, 13, 31, 37, 39, 49, 57, 73, 75, ...
64Sloane's A031197255, 466, 525, 552, 646, 664, ...
610Sloane's A0311982, 6, 7, 8, 11, 12, 14, 15, 17, 19, ...
630Sloane's A0311993, 4, 5, 16, 18, 22, 29, 30, 33, ...
71Sloane's A0312011, 10, 100, 1000, 1259, 1295, ...
72Sloane's A03120222, 202, 220, 256, 265, 526, 562, ...
73Sloane's A031203124, 142, 148, 184, 214, 241, 259, ...
76 7, 70, 700, 7000, 70000, 700000, ...
712Sloane's A03120417, 26, 47, 59, 62, 71, 74, 77, 89, ...
714Sloane's A0312053, 30, 111, 156, 165, 249, 294, ...
721Sloane's A03120619, 34, 43, 91, 109, 127, 172, 190, ...
727Sloane's A03120712, 18, 21, 24, 39, 42, 45, 54, 78, ...
730Sloane's A0312084, 13, 16, 25, 28, 31, 37, 40, 46, ...
756Sloane's A0312096, 9, 15, 27, 33, 36, 48, 51, 57, ...
792Sloane's A0312102, 5, 8, 11, 14, 20, 23, 29, 32, 35, ...
81 1, 10, 14, 17, 29, 37, 41, 71, 73, ...
825 2, 7, 11, 15, 16, 20, 23, 27, 32, ...
8154 3, 4, 5, 6, 8, 9, 12, 13, 18, 19, ...
91 1, 4, 10, 40, 100, 400, 1000, 1111, ...
92 127, 172, 217, 235, 253, 271, 325, ...
93 444, 4044, 4404, 4440, 4558, ...
94 7, 13, 31, 67, 70, 76, 103, 130, ...
98 22, 28, 34, 37, 43, 55, 58, 73, 79, ...
910 14, 38, 41, 44, 83, 104, 128, 140, ...
919 5, 26, 50, 62, 89, 98, 155, 206, ...
924 16, 61, 106, 160, 337, 373, 445, ...
928 19, 25, 46, 49, 52, 64, 91, 94, ...
930 2, 8, 11, 17, 20, 23, 29, 32, 35, ...
980 6, 9, 15, 18, 24, 33, 42, 48, 51, ...
993 3, 12, 21, 27, 30, 36, 39, 45, 54, ...
101Sloane's A0115571, 10, 100, 1000, 10000, 100000, ...
106 266, 626, 662, 1159, 1195, 1519, ...
107 46, 58, 64, 85, 122, 123, 132, ...
1017 2, 4, 5, 11, 13, 20, 31, 38, 40, ...
1081 17, 18, 37, 71, 73, 81, 107, 108, ...
10123 3, 6, 7, 8, 9, 12, 14, 15, 16, 19, ...

See also 196-Algorithm, Additive Persistence, Digit,Digital Root, Multiplicative Persistence, Narcissistic Number, Recurring Digital Invariant

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