A138695 Primes p such that 24*p-1, 24*p+1 and 30*p-1, 30*p+1 are twin primes.

43, 113, 9283, 13147, 14057, 17977, 26893, 34273, 47123, 47543, 56477, 60887, 75557, 123803, 137873, 153623, 163337, 201797, 250307, 284747, 325697, 333787, 349637, 356287, 358597, 447217, 455687, 538943, 561553, 563263, 582317, 616757

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1600

Example

24*43-1=1031, 24*43+1=1033; 30*43-1=1289, 30*43+1=1291.

Mathematica

a=24; b=30; Select[Prime[Range[14^4]], PrimeQ[a*#-1]&&PrimeQ[a*#+1]&&PrimeQ[b*#-1]&&PrimeQ[b*#+1]&]

Prog

(Magma) [p: p in PrimesUpTo(1000)| IsPrime(24*p-1) and IsPrime(24*p+1) and IsPrime(30*p-1) and IsPrime(30*p+1)]; // Vincenzo Librandi, Nov 24 2010

Crossrefs

Sequence in context: A039471 A104783 A142081 * A297412 A282294 A251075

Adjacent sequences: A138692 A138693 A138694 * A138696 A138697 A138698

Keyword

nonn,easy

Author

Vladimir Joseph Stephan Orlovsky, May 15 2008

Status

approved