A163624 - OEIS

%I #18 Sep 08 2022 08:45:46

%S 2,5,10,11,15,18,19,21,25,26,28,35,37,38,40,44,46,47,49,51,53,54,57,

%T 58,61,63,64,68,71,72,73,75,77,80,81,86,93,102,105,106,107,112,114,

%U 116,119,120,126,127,128,130,138,141,142,145,148,149,151,154,159,162,164,165

%N Numbers n such that 120n+1 is prime.

%H Vincenzo Librandi, <a href="/A163624/b163624.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) = (A163623(n)-1)/120.

%t Select[Range[200], PrimeQ[120 # + 1] &] (* _Harvey P. Dale_, May 29 2013 *)

%o (Magma) [n: n in [0..250]|IsPrime(120*n+1)]; // _Vincenzo Librandi_, Dec 13 2010

%o (PARI) is(n)=isprime(120*n+1) \\ _Charles R Greathouse IV_, Feb 20 2017

%Y Cf. A163623.

%K nonn,easy

%O 1,1

%A _Zak Seidov_, Aug 01 2009