A045340 - OEIS

%I #11 Jul 04 2025 18:41:14

%S 2,3,13,17,23,29,31,37,41,43,59,71,73,79,83,97,101,107,113,127,139,

%T 149,157,163,167,181,191,197,199,211,223,227,233,239,241,251,269,281,

%U 283,293,307,311,317,331,337,349

%N Primes congruent to {1, 2, 3, 6} mod 7.

%H Vincenzo Librandi, <a href="/A045340/b045340.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Prime[Range[300]],MemberQ[{1,2,3,6},Mod[#,7]]&] (* _Vincenzo Librandi_, Aug 10 2012 *)

%o (Magma) [p: p in PrimesUpTo(500) | p mod 7 in [1, 2, 3, 6]]; // _Vincenzo Librandi_, Aug 10 2012

%Y Cf. A000040.

%K nonn,easy

%O 1,1

%A _N. J. A. Sloane_