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URL: https://oeis.org/A160358

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A160358
Indices of primes in A133547, i.e., numbers n such that the sum of the squares of the first n odd primes is prime.
2
3, 5, 9, 11, 23, 29, 63, 65, 71, 95, 141, 159, 161, 173, 179, 183, 209, 219, 255, 299, 323, 341, 365, 371, 389, 393, 453, 485, 521, 567, 579, 605, 623, 633, 635, 639, 677, 701, 711, 723, 725, 747, 785, 827, 867, 945, 981, 993, 999, 1001, 1013, 1035, 1037, 1041
OFFSET
1,1
COMMENTS
All terms are necessarily odd. Thus one could also consider the sequence floor(a(n)/2) = (1,2,4,5,11,14,31,32,35,...). Other possible variations would be to list the index a(n)+1 of the largest prime in that sum, or, since this is always even, (a(n)+1)/2 = (2,3,5,6,12,15,32,33,36,...).
FORMULA
A160359(n) = A133547(a(n)) = A024450(a(n)+1) - 4.
PROG
(PARI) s=0; for( i=2, 1999, isprime(s+=prime(i)^2) & print1(i-1, ", "))
CROSSREFS
Sequence in context: A256220 A163778 A328643 * A319084 A120806 A020946
KEYWORD
nonn
AUTHOR
M. F. Hasler, May 18 2009
STATUS
approved