A094205 Lower bounds of twin prime pairs of the form prime(2n+1).

5, 11, 17, 41, 59, 137, 149, 179, 191, 197, 227, 269, 347, 419, 431, 461, 599, 617, 1019, 1031, 1229, 1289, 1319, 1427, 1607, 1697, 1787, 2027, 2081, 2087, 2141, 2309, 2381, 2549, 2591, 2711, 2789, 3299, 3329, 3359, 3371, 3389, 3539, 3581, 3929, 4001, 4019

Offset

0,1

Links

Harvey P. Dale, Table of n, a(n) for n = 0..1000

Example

For n=3, 2n+1 = 7 and prime(7) = 17 the lower bound of the (17,19) twin prime pair.

Mathematica

Select[Table[Prime[2n+1], {n, 300}], PrimeQ[#+2]&] (* Harvey P. Dale, Jul 07 2017 *)

Prog

(PARI) f(n, start, step) = forstep(x=start, n, step, y=prime(x); if(isprime(y+2), print1(y", ")))

Crossrefs

Sequence in context: A297583 A356756 A088903 * A136091 A184968 A341357

Adjacent sequences: A094202 A094203 A094204 * A094206 A094207 A094208

Keyword

easy,nonn

Author

Cino Hilliard, May 26 2004

Status

approved