A092510 - OEIS

A092510

Difference between smallest semiperimeter (see A063655) and its integer log (see A001414).

2, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 3, 0, 1, 1, 1, 2, 0, 0, 0, 2, 1, 0, 0, 2, 1, 1, 1, 0, 3, 0, 1, 3, 0, 3, 0, 0, 1, 4, 0, 2, 0, 0, 1, 4, 1, 0, 3, 4, 0, 1, 1, 0, 0, 3, 1, 5, 1, 0, 7, 0, 0, 1, 1, 5, 6, 0, 1, 5, 0, 0, 0, 2, 1, 6, 0, 0, 0, 0, 0, 7, 1, 5, 3, 6, 1, 1, 1, 2, 7, 0

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OFFSET

1,1

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..16384

FORMULA

a(n) = A063655(n) - A001414(n).

EXAMPLE

If p is prime a(p)=1 because A063655(p) = p+1 and A001414(p) = p.

PROG

(PARI)

A001414(n) = { my(f=factor(n)); sum(k=1, matsize(f)[1], f[k, 1]*f[k, 2]); }; \\ From A001414.