A186811 Twin primes of the form k*6^m-1 and k*6^m+1, where k is prime.

11, 13, 17, 19, 29, 31, 41, 43, 71, 73, 101, 103, 107, 109, 137, 139, 179, 181, 281, 283, 431, 433, 617, 619, 641, 643, 821, 823, 827, 829, 1697, 1699, 1877, 1879, 2081, 2083, 2237, 2239, 2381, 2383, 2591, 2593

Offset

1,1

Comments

Twins are obtained by comparing the values given in A185069 and A186782.

Links

Table of n, a(n) for n=1..42.

Example

17*6^13-1 and 17*6^13+1 are twins.

Mathematica

maxM = 5; r = Select[Prime[Range[PrimePi[2*6^maxM]]], PrimeQ[# + 2] &] + 1; u = Sort[Flatten[Table[Select[r, PrimeQ[#/6^k] &] - 1, {k, maxM}]]]; Sort[Join[u, u + 2]] (* T. D. Noe, Feb 28 2011 *)

Prog

See A185069 and A186782.

Crossrefs

Cf. A185069, A186782.

Sequence in context: A215927 A229947 A132247 * A038926 A356466 A168446

Adjacent sequences: A186808 A186809 A186810 * A186812 A186813 A186814

Keyword

nonn

Author

Gilbert Mozzo, Feb 27 2011

Status

approved