A328310 a(n) = A051903(A003415(n)) - A051903(n).

-1, -1, 0, -1, 0, -1, -1, -1, 0, -1, 2, -1, 1, 2, 1, -1, -1, -1, 1, 0, 0, -1, -1, -1, 0, 0, 3, -1, 0, -1, -1, 0, 0, 1, 0, -1, 0, 3, -1, -1, 0, -1, 2, -1, 1, -1, 0, -1, 0, 1, 1, -1, 1, 3, -1, 0, 0, -1, 0, -1, 0, -1, 0, 1, 0, -1, 1, 0, 0, -1, -1, -1, 0, -1, 2, 1, 0, -1, 0, -1, 0, -1, 0, 0, 1, 4, -1, -1, -1, 1, 3, 0, 1, 2

Offset

2,11

Links

Antti Karttunen, Table of n, a(n) for n = 2..20000

Formula

a(n) = A051903(A003415(n)) - A051903(n).

a(n) = A328311(n) - 1.

Prog

(PARI)
A003415(n) = if(n<=1, 0, my(f=factor(n)); n*sum(i=1, #f~, f[i, 2]/f[i, 1]));
A051903(n) = if((1==n), 0, vecmax(factor(n)[, 2]));
A328310(n) = (A051903(A003415(n)) - A051903(n));

Crossrefs

Cf. A003415, A051903, A328320, A328321.

One less than A328311.

Sequence in context: A176047 A067461 A321765 * A136673 A283149 A097588

Adjacent sequences: A328307 A328308 A328309 * A328311 A328312 A328313

Keyword

sign

Author

Antti Karttunen, Oct 13 2019

Status

approved