A278520 a(n) = A243503(n) - A056239(n).

0, 0, 0, 0, 0, 1, 0, 0, -1, 2, 0, 2, 0, 3, 0, 0, 0, 0, 0, 4, 1, 4, 0, 3, -2, 5, -2, 6, 0, 2, 0, 0, 2, 6, -1, 1, 0, 7, 3, 6, 0, 4, 0, 8, 0, 8, 0, 4, -3, 0, 4, 10, 0, -1, 0, 9, 5, 9, 0, 4, 0, 10, 2, 0, 1, 6, 0, 12, 6, 2, 0, 2, 0, 11, -2, 14, -2, 8, 0, 8, -3, 12, 0, 7, 2, 13, 7, 12, 0, 2, -1, 16, 8, 14, 3, 5, 0, 0, 4, 2, 0, 10, 0, 15, 0, 15, 0, 0, 0, 4, 9, 12, 0, 12

Offset: 1

Author

Antti Karttunen, Dec 11 2016

Keywords

• sign

Comments

The 223rd zero in this sequence occurs at n=1078 (a(1078) = 0, 1078 = 2*7*7*11) and it is the first zero that is not included in A241912.

Links

• Antti Karttunen, Table of n, a(n) for n = 1..8192

Crossrefs

Cf. A056239, A243503.

Cf. A241912 (gives the subset of the indices of zeros).

Formula

a(n) = A243503(n) - A056239(n).

a(A241912(n)) = 0 [but obtains zeros also for other values, see comments.]