A129806 Primes congruent to +-5 mod 18.

5, 13, 23, 31, 41, 59, 67, 103, 113, 131, 139, 149, 157, 167, 193, 211, 229, 239, 257, 283, 293, 311, 337, 347, 373, 383, 401, 409, 419, 463, 491, 499, 509, 563, 571, 599, 607, 617, 643, 653, 661, 733, 743, 751, 761, 769, 787, 797, 823, 859, 877, 887, 941, 967, 977, 1013

Offset: 1

Author

N. J. A. Sloane, May 22 2007

Keywords

• nonn
• easy

Comments

Primes congruent to (5,13) mod 18. - Vincenzo Librandi, Aug 14 2012

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000
• Emma Lehmer, On special primes, Pac. J. Math., 118 (1985), 471-478.

Crossrefs

Cf. A129805, A129807.

Programs

Magma

[ p: p in PrimesUpTo(1300) | p mod 18 in {5, 13} ]; // Vincenzo Librandi, Aug 14 2012

Mathematica

Select[Prime[Range[4000]],MemberQ[{5,13},Mod[#,18]]&] (* Vincenzo Librandi, Aug 14 2012 *)