A102338 Numbers k such that 10k+3 is prime.

0, 1, 2, 4, 5, 7, 8, 10, 11, 16, 17, 19, 22, 23, 26, 28, 29, 31, 35, 37, 38, 43, 44, 46, 50, 52, 56, 59, 61, 64, 65, 67, 68, 73, 74, 77, 82, 85, 86, 88, 95, 98, 101, 103, 106, 109, 110, 112, 115, 116, 119, 121, 122, 128, 130, 137, 142, 143, 145, 148, 149, 152, 154, 155

Offset: 1

Author

Parthasarathy Nambi, Feb 20 2005

Keywords

• nonn

Examples

			For n=1, 10k+3 = 13 (prime).
For n=26, 10k+3 = 263 (prime).
For n=50, 10k+3 = 503 (prime).
		

Links

• Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A023238 (subsequence of primes), A030431, A049508.

Programs

Magma

[n: n in [0..1000]| IsPrime(10*n+3)]; // Vincenzo Librandi, Apr 06 2011

Mathematica

Select[Range[0, 160], PrimeQ[10# + 3] &] (* Ray Chandler, Nov 07 2006 *)

PARI

isok(n) = isprime(10*n+3); \\ Michel Marcus, Sep 08 2016

Extensions

Edited and extended by Ray Chandler, Nov 07 2006