A228353 Primes of the form 3p - 4 where p is prime.

2, 5, 11, 17, 29, 47, 53, 83, 89, 107, 137, 173, 179, 197, 233, 263, 317, 389, 443, 449, 467, 569, 587, 593, 677, 683, 719, 809, 827, 839, 929, 947, 1097, 1163, 1187, 1223, 1259, 1289, 1367, 1433, 1493, 1523, 1559, 1619, 1637, 1667, 1709, 1847, 1889, 1973, 1979

Offset: 1

Author

Irina Gerasimova, Aug 20 2013

Keywords

• nonn
• less
• easy

Comments

Subsequence of A003627. - Michel Marcus, May 30 2015

Links

• Paolo P. Lava, Table of n, a(n) for n = 1..300

Crossrefs

Cf. A228121, A258261, A003627.

Programs

Mathematica

Select[3*Prime[Range[200]]-4, PrimeQ] (* Zak Seidov, May 24 2015 *)

PARI

is(n)=n%3==2 && isprime(n\3+2) && isprime(n) \\ Charles R Greathouse IV, Mar 18 2014

Formula

a(n) = 3*A258261(n)-4. Zak Seidov, May 24 2015

a(n) >> n*log^2 n. - _Charles R Greathouse IV, Jun 04 2015