A328591 - OEIS

A328591

Even bisection of A328590: a(n) = A328578(2n) - A257993(2n).

1, 2, 0, 2, 3, -1, 3, 2, 0, 4, 4, -1, 4, 5, -2, 2, 1, 0, 3, 4, -1, 4, 4, 0, 5, 5, -1, 5, 3, -2, 3, 2, 0, 4, 4, -1, 5, 5, 0, 5, 6, -1, 4, 6, -2, 4, 5, 0, 5, 5, -1, 5, 6, 0, 6, 3, -1, 7, 7, -2, 1, 5, 0, 6, 6, -1, 6, 5, 0, 7, 7, -1, 7, 8, -2, 2, 1, 0, 6, 7, -1, 7, 3, 0, 7, 5, -1, 3, 8, -2, 6, 2, 0, 7, 7, -1, 7, 8, 0, 8, 8, -1, 8, 9, -1

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

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

Index entries for sequences related to primorial base

FORMULA

a(n) = A328590(2n) = A328578(2n) - A257993(2n).

PROG

(PARI)

A257993(n) = { for(i=1, oo, if(n%prime(i), return(i))); }

A276086(n) = { my(m=1, p=2); while(n, m *= (p^(n%p)); n = n\p; p = nextprime(1+p)); (m); };