A278520 - OEIS

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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

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OFFSET

1,10

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

FORMULA

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

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

CROSSREFS

Cf. A056239, A243503.