A323915 - OEIS

A323915

a(n) = A023900(A005940(1+n)).

1, -1, -2, -1, -4, 2, -2, -1, -6, 4, 8, 2, -4, 2, -2, -1, -10, 6, 12, 4, 24, -8, 8, 2, -6, 4, 8, 2, -4, 2, -2, -1, -12, 10, 20, 6, 40, -12, 12, 4, 60, -24, -48, -8, 24, -8, 8, 2, -10, 6, 12, 4, 24, -8, 8, 2, -6, 4, 8, 2, -4, 2, -2, -1, -16, 12, 24, 10, 48, -20, 20, 6, 72, -40, -80, -12, 40, -12, 12, 4, 120, -60, -120, -24, -240, 48, -48

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OFFSET

0,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..16384

Antti Karttunen, Data supplement: n, a(n) computed for n = 0..65537

Index entries for sequences related to binary expansion of n

FORMULA

a(n) = A023900(A005940(1+n)).

PROG

(PARI) A323915(n) = { my(m1=1, p=2); while(n, if(!(n%2), p=nextprime(1+p), if(1==(n%4), m1 *= (1-p))); n>>=1); (m1); };

(PARI)