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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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12
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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
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OFFSET
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1,1
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COMMENTS
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a(n) must clearly be even.
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LINKS
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EXAMPLE
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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
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Select[Range[1000], PrimeQ[Sum[Prime[i]^2, {i, #}]] &] (* Carl Najafi, Aug 22 2011 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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