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 A320001 Number of proper divisors of n of the form 6*k + 1. 7
 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 2, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 2, 1, 2, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 3, 1, 2, 1, 2, 1, 1, 3, 1, 2, 1, 1, 1, 2, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,14 LINKS Antti Karttunen, Table of n, a(n) for n = 1..65537 FORMULA a(n) = A279060(n) - [+1 = n (mod 6)], where [ ] is the Iverson bracket, giving 1 only when n = 1 mod 6, and 0 otherwise. a(n) = A320015(n) - A320005(n). a(n) = A007814(A319991(n)). PROG (PARI) A320001(n) = if(!n, n, sumdiv(n, d, (d

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Last modified December 6 14:15 EST 2019. Contains 329806 sequences. (Running on oeis4.)