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%I #17 Nov 21 2022 12:31:59
%S 1,1,0,1,0,1,0,0,0,0,0,0,0,0,0,0,-1,0,-1,-1,0,0,-1,-1,0,0,0,0,-1,-1,
%T -1,-1,-1,-1,-1,0,-1,-1,-1,-1,-2,-1,-2,-2,-1,-1,-2,-1,-1,-1,-1,-1,-1,
%U -1,-1,-1,0,0,-1,0,-1,-1,-1,0,0,0,0,0,0,0,-1,-1,-1,-1
%N Difference in number of 0's in first n terms of Van Eck's sequence and number of primes less than or equal to n.
%F a(n) = A171896(n) - A000720(n).
%e a(41) = -2 because there are 11 0's in the first 41 terms of Van Eck's sequence and 13 prime numbers less than or equal to 41, and 11 - 13 = -2.
%Y Cf. A000040, A000720, A171896.
%K sign
%O 1,41
%A _G. L. Honaker, Jr._, Nov 13 2022
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