A142819 - OEIS

%I #7 Sep 08 2022 08:45:37

%S 509,631,997,1607,1973,2339,3559,3803,4657,5023,6121,7219,7829,7951,

%T 8317,9049,9293,9781,10391,10513,11489,12343,12953,13441,13807,14051,

%U 14173,14783,15149,15271,15881,16369,16979,17467,18077,18199,18443,19541,20029,20639

%N Primes congruent to 21 mod 61.

%H Vincenzo Librandi, <a href="/A142819/b142819.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Prime[Range[2600]], MemberQ[{21}, Mod[#, 61]] &] (* _Vincenzo Librandi_, Sep 05 2012 *)

%o (Magma) [p: p in PrimesUpTo(21000) | p mod 61 eq 21 ]; // _Vincenzo Librandi_, Sep 05 2012

%Y Cf. A000040.

%K nonn,easy

%O 1,1

%A _N. J. A. Sloane_, Jul 11 2008