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A260557
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Primes p such that p = q^2 + 10*r^2 where q and r are also primes.
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5
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89, 139, 211, 379, 401, 419, 499, 569, 619, 659, 881, 1019, 1051, 1091, 1259, 1409, 1451, 1459, 1499, 1571, 1619, 1699, 1721, 1811, 1889, 1931, 1979, 2099, 2339, 2459, 2531, 2579, 2699, 2939, 3011, 3251, 3299, 3371, 3539, 3571, 3659, 3761, 3779, 3851, 4019
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OFFSET
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1,1
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LINKS
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EXAMPLE
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419 is in the sequence because 419 = 13^2 + 10*5^2 and 419, 13 and 5 are all primes.
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MATHEMATICA
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Select[#1^2 + 10 #2^2 & @@ # & /@ Tuples[Prime@ Range@ 36, 2], PrimeQ] // Sort (* Michael De Vlieger, Jul 29 2015 *)
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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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