

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
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OFFSET

1,1


COMMENTS

a(n) must clearly be even.


LINKS



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



KEYWORD

nonn


AUTHOR



STATUS

approved



