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.

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A089152 Primes p such that 6*p-7 and 6*p-5 are twin primes and p is also a twin prime.

Original entry on oeis.org

3, 11, 13, 19, 31, 41, 59, 71, 73, 101, 139, 193, 239, 269, 271, 313, 349, 433, 521, 643, 823, 829, 881, 1051, 1061, 1093, 1621, 1669, 1723, 1951, 2549, 2999, 3359, 3373, 3463, 3469, 3583, 4019, 4219, 4481, 4483, 4519, 5233, 5639, 5881, 6089, 6131, 6133
Offset: 1

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Author

Pierre CAMI, Dec 06 2003

Keywords

Examples

			6*19-7 = 107, 6*19-5 = 109, 107 and 109 are twin primes and 19 has 17 as twin.
		

Crossrefs

Subsequence of A089151.

Programs

  • Magma
    [p: p in PrimesUpTo(6500) |(IsPrime(p-2) or  IsPrime(p+2)) and IsPrime(6*p-5) and IsPrime(6*p-7)]; // Vincenzo Librandi, Jan 17 2019
  • Maple
    P:= {seq(ithprime(i),i=1..20000)}:
    A:= P intersect (map(`-`,P,2) union map(`+`,P,2)) intersect map(t -> (t+5)/6, P) intersect map(t -> (t+7)/6, P):
    sort(convert(A,list)); # Robert Israel, Jan 16 2019

Extensions

2 and 173 removed by R. J. Mathar, Nov 13 2009
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