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A051648 Primes of form 210*p + 1 where p is a prime. 1

%I #9 May 28 2018 09:38:41

%S 421,631,1051,1471,2311,2731,3571,4831,6091,9871,11131,12391,14071,

%T 15331,17431,18691,21211,28771,29191,32971,34231,37591,38011,40111,

%U 40531,46831,48091,52711,56911,58171,59011,65731,66571,72871,73291

%N Primes of form 210*p + 1 where p is a prime.

%C Generalization of A005385. Can be called 210-safe primes.

%F A002110(4)*p + 1 = 210*p + 1 (prime).

%e 631 is in the sequence because 631 = 210*p + 1, where p=3.

%t Select[Table[210n+1,{n,Prime[Range[100]]}],PrimeQ] (* _Harvey P. Dale_, Dec 25 2016 *)

%Y Cf. A005384, A005385, A007693, A002110.

%K nonn

%O 1,1

%A _Labos Elemer_

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Last modified March 28 08:02 EDT 2024. Contains 371236 sequences. (Running on oeis4.)