OFFSET
1,1
COMMENTS
Positions of 2 in A277543. Numbers that have 2 as their rightmost nonzero digit when written in base 5.
This is one sequence in a 4-way splitting of the positive integers; the other three are indicated in the Mathematica program.
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..10000
MATHEMATICA
PROG
(PARI) isok(n) = n/5^valuation(n, 5) % 5 == 2; \\ Michel Marcus, Oct 21 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Oct 20 2016
STATUS
approved