cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A049489 Primes p such that p + 32 is also prime.

Original entry on oeis.org

5, 11, 29, 41, 47, 71, 107, 131, 149, 167, 179, 191, 197, 239, 251, 281, 317, 347, 389, 401, 431, 467, 491, 509, 569, 587, 599, 641, 659, 677, 701, 719, 797, 821, 827, 887, 977, 1019, 1031, 1061, 1091, 1097, 1181, 1217, 1259, 1289, 1367, 1427, 1439, 1451
Offset: 1

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Examples

			29 and 29 + 32 = 61 are both prime.
		

Crossrefs

Programs

  • Magma
    [p: p in PrimesUpTo(2000) | IsPrime(p+32)]; // Vincenzo Librandi, Apr 22 2015
  • Maple
    Primes:= select(isprime,{seq(i,i=3..10000,2)}):
    sort(convert(Primes intersect map(`-`,Primes,32),list)); # Robert Israel, Dec 20 2015
  • Mathematica
    Select[Range[2000], PrimeQ[#] && PrimeQ[# + 32] &] (* Vincenzo Librandi, Apr 22 2015 *)
    Select[Prime[Range[300]],PrimeQ[#+32]&] (* Harvey P. Dale, Oct 14 2017 *)
  • PARI
    isok(n) = isprime(n) && isprime(n+32); \\ Michel Marcus, Dec 31 2013
    

Extensions

Name improved by Bruno Berselli, Apr 22 2015