A108061 - OEIS

A108061

Numbers n such that 193*n + 191 is prime.

0, 2, 20, 26, 30, 32, 42, 54, 62, 72, 96, 114, 126, 132, 134, 140, 144, 152, 174, 176, 182, 194, 200, 204, 216, 222, 240, 270, 282, 302, 314, 324, 350, 356, 372, 404, 422, 446, 450, 452, 470, 474, 480, 504, 506, 510, 522, 524, 530, 552, 560, 572, 594, 620, 624

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OFFSET

1,2

COMMENTS

191 and 193 are twin primes.

LINKS

Table of n, a(n) for n=1..55.

Chris Caldwell, The First 1,008 Twin Primes.

EXAMPLE

If n=72, then 193*n + 191 = 14087 (prime).

MAPLE

a:=proc(n) if isprime(193*n+191)=true then n else fi end: seq(a(n), n=0..700); # Emeric Deutsch, Jun 10 2005