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Search: id:A160358
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| A160358 |
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Indices of primes in A133547, i.e. numbers n such that the sum of the squares of the first n odd primes is prime. |
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+0
2
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| 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
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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All terms are necessarily odd. Thus one could also consider the sequence [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,...).
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FORMULA
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A160359(n) = A133547(a(n)) = A024450(a(n)+1)-4.
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PROGRAM
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(PARI) s=0; for( i=2, 1999, isprime(s+=prime(i)^2) & print1(i-1, ", "))
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CROSSREFS
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Cf. A098561, A133547.
Sequence in context: A113488 A092917 A163778 this_sequence A120806 A020946 A091785
Adjacent sequences: A160355 A160356 A160357 this_sequence A160359 A160360 A160361
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KEYWORD
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nonn
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AUTHOR
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M. F. Hasler (MHasler(AT)univ-ag.fr), May 18 2009
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