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A142792
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Primes congruent to 31 mod 60.
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2
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31, 151, 211, 271, 331, 571, 631, 691, 751, 811, 991, 1051, 1171, 1231, 1291, 1471, 1531, 1831, 1951, 2011, 2131, 2251, 2311, 2371, 2551, 2671, 2731, 2791, 2851, 2971, 3271, 3331, 3391, 3511, 3571, 3631, 3691, 3931, 4051, 4111, 4231, 4591, 4651, 4831, 4951
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OFFSET
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1,1
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..1000
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FORMULA
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a(n) ~ 16n log n. - Charles R Greathouse IV, Jul 03 2016
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MATHEMATICA
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Select[Prime[Range[1000]], Mod[#, 60]==31&] (* Harvey P. Dale, Mar 14 2011 *)
Select[Prime[Range[800]], MemberQ[{31}, Mod[#, 60]] &] (* Vincenzo Librandi, Sep 04 2012 *)
Select[Range[31, 5000, 60], PrimeQ] (* Faster because it tests fewer numbers than the programs above *) (* Harvey P. Dale, Nov 13 2013 *)
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PROG
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(Magma) [p: p in PrimesUpTo(6000) | p mod 60 eq 31 ]; // Vincenzo Librandi, Sep 04 2012
(PARI) is(n)=isprime(n) && n%60==31 \\ Charles R Greathouse IV, Jul 03 2016
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CROSSREFS
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Cf. A000040.
Sequence in context: A124994 A126418 A347109 * A201964 A226890 A104049
Adjacent sequences: A142789 A142790 A142791 * A142793 A142794 A142795
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane, Jul 11 2008
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STATUS
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approved
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