

A306503


a(n) is the index in primes of A306500(n), or 0 if A306500(n) = 0.


3



23338590792, 2946, 1, 2, 3, 1, 5, 2, 1, 3, 1, 5, 1, 5, 16, 1, 6, 7, 1, 2, 3, 38, 2, 1, 1, 5, 3, 1, 11, 11, 1, 1, 2, 9, 1, 13, 2, 1, 6, 15, 1, 3, 8, 4, 5, 1, 43, 1, 2, 8, 1, 1760, 2, 1, 10, 3, 1, 13, 29, 1, 5, 1, 11, 17, 2, 1, 8, 1, 5, 16, 1, 171, 33, 1, 4, 1, 2, 3
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OFFSET

1,1


COMMENTS

a(n) is the smallest integer k such that Sum_{i=1..k} Kronecker(A003657(n),prime(i)) > 0, or 0 if no such k exists.
See A306500 for the actual primes.


LINKS

Table of n, a(n) for n=1..78.


EXAMPLE

See A306500 for the example that shows a(18) = 7.


PROG

(PARI) b(n) = my(i=0); forprime(p=2, oo, i+=kronecker(n, p); if(i>0, return(p)))
print1(23338590792, ", "); for(n=4, 300, if(isfundamental(n), print1(primepi(b(n)), ", ")))


CROSSREFS

Cf. A003657, A306500, A306502.
Sequence in context: A129250 A216398 A121841 * A096630 A297005 A233841
Adjacent sequences: A306500 A306501 A306502 * A306504 A306505 A306506


KEYWORD

nonn


AUTHOR

Jianing Song, Feb 19 2019


STATUS

approved



