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A095093
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Number of 4k+3 primes whose Legendre-vector is not Dyck-path (A095103) in range ]2^n,2^(n+1)].
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6
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0, 0, 0, 1, 1, 3, 6, 12, 21, 41, 77, 143, 287, 530, 1010, 1967, 3711, 7125, 13806, 26525, 51126
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OFFSET
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1,6
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LINKS
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Table of n, a(n) for n=1..21.
A. Karttunen and J. Moyer, C-program for computing the initial terms of this sequence
Index entries for sequences related to occurrences of various subsets of primes in range ]2^n,2^(n+1)]
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FORMULA
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a(n) = A095008(n) - A095092(n).
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PROG
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(PARI) is(m) = {my(s=0); if(isprime(m), for(i=1, m-1, if((s+=kronecker(i, m))<0, return(1)))); 0; }
a(n) = {my(c=0); forstep(m=2^n+3, 2^(n+1), 4, c+=is(m)); c; } \\ Jinyuan Wang, Jul 20 2020
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CROSSREFS
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Cf. A095103.
Sequence in context: A092176 A000991 A345028 * A280473 A333820 A139422
Adjacent sequences: A095090 A095091 A095092 * A095094 A095095 A095096
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KEYWORD
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nonn,more
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AUTHOR
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Antti Karttunen, Jun 01 2004
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STATUS
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approved
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