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A098561
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Numbers n such that the sum of the squares of the first n primes is prime.
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11
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2, 18, 26, 36, 68, 78, 144, 158, 164, 174, 192, 212, 216, 236, 264, 288, 294, 338, 344, 356, 384, 404, 416, 426, 500, 516, 518, 522, 534, 540, 548, 614, 678, 680, 782, 858, 866, 876, 878, 896, 900, 912, 950, 974, 996, 1064, 1080, 1082, 1100, 1122, 1158, 1160
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(n) must clearly be even.
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LINKS
| Zak Seidov, Table of n, a(n) for n = 1..1050
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EXAMPLE
| 2 is a term as the sum of the squares of the first two primes is 2^2 + 3^2 = 13, which is prime.
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MATHEMATICA
| Select[Range[1000], PrimeQ[Sum[Prime[i]^2, {i, #}]] &] (* Carl Najafi, Aug 22 2011 *)
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CROSSREFS
| Cf. A098562 (corresponding primes), A024450 (sums of squares of primes), A098563 (sums of cubes of primes), A013916 (sums of primes).
Sequence in context: A031104 A115042 A191461 * A141426 A101844 A193598
Adjacent sequences: A098558 A098559 A098560 * A098562 A098563 A098564
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KEYWORD
| nonn
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AUTHOR
| Rick L. Shepherd (rshepherd2(AT)hotmail.com), Sep 14 2004
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