Least Prime Factor
For an Integer 
, let 
denote the Least Prime Factor of 
, i.e., the number 
inthe factorization
with
for 
. For 
, 3, ..., the first few are 2, 3, 2, 5, 2, 7, 2, 3, 2, 11, 2, 13, 2, 3, ...(Sloane's A020639). The above plot of the least prime factor function can be seen to resemble a jagged terrain of mountains,which leads to the appellation of ``Twin Peaks'' to a Pair of Integers 
such that- 1.
, - 2.
, - 3. For all
, 
Implies 
.
References
Sloane, N. J. A.A020639 andA046027 in ``An On-Line Version of the Encyclopedia of Integer Sequences.''http://www.research.att.com/~njas/sequences/eisonline.html.
- Information Entropy
- Information Theory
- Initial Value Problem
- Injection
- Injective
- Injective Patch
- Inner Automorphism Group
- Inner Product
- Inner Product Space
- Inradius
- Inscribed
- Inscribed Angle
- Inside-Outside Theorem
- Insphere
- Instrument Function
- Insufficient Reason Principle
- Int
- Integer
- Integer Division
- Integer Factorization
- Integer-Matrix Form
- Integer Module
- Integer Part
- Integer Relation
- Integer Sequence