A089161 Numbers k such that 30*k + 17 and 30*k + 19 are twin primes.

0, 3, 4, 6, 7, 11, 20, 27, 28, 42, 47, 49, 53, 55, 56, 59, 62, 66, 67, 69, 74, 75, 88, 89, 105, 108, 115, 117, 118, 125, 130, 137, 138, 140, 144, 150, 151, 154, 159, 165, 180, 182, 188, 195, 206, 227, 231, 237, 243, 248, 249, 251, 258, 262, 269, 279, 284, 286, 287

Offset

1,2

Links

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

Example

3 is a term since 30*3 + 17 = 107, 30 * 3 + 19 = 109, and (107, 109) are twin primes.

Maple

a:=proc(n) if isprime(30*n+17)=true and isprime(30*n+19)=true then n else fi end: seq(a(n), n=0..400); # Emeric Deutsch, Jun 13 2005

Mathematica

Select[Range[0, 300], And @@ PrimeQ[30# + {17, 19}] &] (* Amiram Eldar, Jan 27 2020 *)

Crossrefs

Intersection of A158648 and A158806.

Cf. A001097 (twin primes).

Sequence in context: A349555 A073906 A108797 * A350475 A060965 A153883

Adjacent sequences: A089158 A089159 A089160 * A089162 A089163 A089164

Keyword

easy,nonn

Author

Pierre CAMI, Dec 06 2003

Extensions

More terms from Emeric Deutsch, Jun 13 2005

Status

approved