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 A094712 Primes that are not the sum of three positive squares. 3
 2, 5, 7, 13, 23, 31, 37, 47, 71, 79, 103, 127, 151, 167, 191, 199, 223, 239, 263, 271, 311, 359, 367, 383, 431, 439, 463, 479, 487, 503, 599, 607, 631, 647, 719, 727, 743, 751, 823, 839, 863, 887, 911, 919, 967, 983, 991 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Except for primes 2, 5, 13 and 37, this sequence consists all primes p such that p = 7 (mod 8). The density of these primes is 0.25. LINKS Chai Wah Wu, Table of n, a(n) for n = 1..10000 MATHEMATICA lst={}; lim=32; Do[n=a^2+b^2+c^2; If[n

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Last modified December 6 04:57 EST 2022. Contains 358594 sequences. (Running on oeis4.)