A124854 Primes p=n/2 such that 5n+3 and 3n+5 are primes.

2, 7, 11, 17, 29, 31, 37, 43, 59, 73, 109, 137, 191, 193, 197, 227, 239, 263, 269, 337, 367, 373, 401, 409, 449, 479, 499, 541, 557, 701, 743, 757, 823, 827, 857, 941, 983, 997, 1033, 1051, 1109, 1163, 1303, 1361, 1471

Offset: 1

Author

Zak Seidov, Nov 10 2006

Keywords

• nonn

Links

• Robert Israel, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A087505, A088879, A124853.

Programs

Maple

select(t -> isprime(t) and isprime(10*t+3) and isprime(6*t+5), [2,seq(i,i=3..10^4,2)]); # Robert Israel, Jun 11 2018

Mathematica

Select[Prime@ Range@ 250, AllTrue[{10 # + 3, 6 # + 5}, PrimeQ] &] (* Michael De Vlieger, Jun 11 2018 *)

PARI

isok(n) = isprime(n) && isprime(10*n+3) && isprime(6*n+5); \\ Michel Marcus, Oct 11 2013