A071186 Numbers k such that prime(2*k)-2*prime(k) is prime.

3, 4, 5, 6, 10, 11, 13, 15, 18, 19, 20, 26, 29, 33, 34, 37, 42, 43, 44, 49, 50, 60, 61, 62, 64, 65, 66, 72, 77, 79, 84, 89, 91, 92, 96, 97, 98, 99, 101, 103, 105, 109, 112, 118, 120, 126, 127, 128, 129, 130, 133, 135, 140, 144, 146, 152, 153, 155, 163, 166, 172, 173

Offset

1,1

Comments

Numbers k such that A066066(k) is prime. - Amiram Eldar, May 19 2022

Links

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

Mathematica

Select[Range[200], PrimeQ[Prime[2*#] - 2*Prime[#]] &] (* Amiram Eldar, May 19 2022 *)

Prog

(PARI) for(n=1, 251, if(isprime(prime(2*n)-2*prime(n))==1, print1(n, ", ")))

Crossrefs

Cf. A000040, A031215, A066066, A100484.

Sequence in context: A047307 A179774 A138918 * A263118 A219041 A218946

Adjacent sequences: A071183 A071184 A071185 * A071187 A071188 A071189

Keyword

easy,nonn

Author

Benoit Cloitre, Jun 10 2002

Status

approved