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 A098561 Numbers n such that the sum of the squares of the first n primes is prime. 12
 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; text; internal format)
 OFFSET 1,1 COMMENTS a(n) must clearly be even. LINKS Zak Seidov, Table of n, a(n) for n = 1..1050 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. MATHEMATICA Select[Range[1000], PrimeQ[Sum[Prime[i]^2, {i, #}]] &] (* Carl Najafi, Aug 22 2011 *) 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 KEYWORD nonn AUTHOR Rick L. Shepherd, Sep 14 2004 STATUS approved

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Last modified December 1 20:14 EST 2023. Contains 367502 sequences. (Running on oeis4.)