A138250 Prime numbers k such that 30*k - 1, 30*k + 1 are twin primes.

2, 5, 19, 41, 43, 71, 113, 131, 167, 223, 229, 281, 331, 383, 457, 461, 467, 509, 541, 593, 797, 839, 937, 947, 971, 1009, 1013, 1087, 1097, 1153, 1231, 1289, 1471, 1553, 1559, 1699, 1787, 2003, 2099, 2113, 2617, 2683, 2689, 2731, 2749, 2861, 2879, 2917

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Example

2*30 - 1 = 59 (prime), 2*30 + 1 = 61 (prime).

Mathematica

a=30; Select[Prime[Range[250]], PrimeQ[a*#-1]&&PrimeQ[a*#+1] &]

Prog

(Magma) [n: n in [0..10000] |IsPrime(n) and IsPrime(30*n-1)and IsPrime(30*n+1)] // Vincenzo Librandi, Aug 03 2010

Crossrefs

Cf. A001097, A001359, A006512.

Sequence in context: A227632 A105889 A086085 * A140761 A077323 A215274

Adjacent sequences: A138247 A138248 A138249 * A138251 A138252 A138253

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, May 05 2008

Status

approved