A111092 Primes congruent to {1,69} mod 70.

71, 139, 211, 281, 349, 419, 421, 491, 631, 701, 769, 839, 911, 1049, 1051, 1259, 1399, 1471, 1609, 1889, 2029, 2099, 2239, 2309, 2311, 2381, 2521, 2591, 2659, 2729, 2731, 2801, 2939, 3011, 3079, 3221, 3359, 3361

Offset: 1

Author

Giorgio Balzarotti and Paolo P. Lava, Oct 13 2005

Keywords

• nonn
• easy

Comments

For every prime p here, the cyclotomic polynomial Phi(35p,x) is flat.

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A000040, A117223.

Programs

Magma

[p: p in PrimesUpTo(4000) | p mod 70 in [1, 69]]; // Vincenzo Librandi, Aug 14 2012

Mathematica

Select[Prime[Range[500]], MemberQ[{1, 69}, Mod[#, 70]] &] (* Vincenzo Librandi, Aug 14 2012 *)

Extensions

Edited by T. D. Noe, May 19 2009