A227907 Primes p such that 4*p - q is also prime, where p, q are consecutive primes.

2, 3, 5, 7, 11, 19, 37, 67, 71, 79, 137, 191, 229, 277, 283, 317, 347, 359, 397, 409, 431, 457, 461, 479, 499, 577, 691, 739, 743, 757, 787, 811, 829, 839, 967, 1009, 1061, 1087, 1091, 1109, 1153, 1193, 1279, 1327, 1373, 1429

Offset

1,1

Links

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

Maple

isA227907 := proc(n)
    local q;
    if isprime(n) then
        q := nextprime(n) ;
        isprime(4*n-q) ;
    else
        false;
    end if;
end proc:
for n from 1 to 3000 do
    if isA227907(n) then
        printf("%d, ", n) ;
    end if;
end do: # R. J. Mathar, Oct 14 2013

Prog

(PARI) isokp(p) = isprime(p) && isprime(4*p - nextprime(p+1)); \\ Michel Marcus, Oct 13 2013

Crossrefs

Sequence in context: A137814 A065726 A215161 * A118985 A092728 A089769

Adjacent sequences: A227904 A227905 A227906 * A227908 A227909 A227910

Keyword

nonn

Author

Irina Gerasimova, Oct 12 2013

Status

approved