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A155737 Primes of the form 4*n^2 + 2*n -1. 3

%I #21 May 03 2024 19:55:39

%S 5,19,41,71,109,271,419,599,701,811,929,1481,1979,2161,2351,2549,2969,

%T 3191,3659,4159,4421,4691,4969,5851,7481,8929,9311,10099,13109,14519,

%U 16001,17029,18089,19181,19739,20879,22051,23869,25121,25759,27059

%N Primes of the form 4*n^2 + 2*n -1.

%C Primes in A125202. - _Klaus Purath_, Dec 09 2020

%H Vincenzo Librandi, <a href="/A155737/b155737.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Table[4n^2+2n-1,{n,0,200}],PrimeQ] (* _Vincenzo Librandi_, Jul 23 2012 *)

%o (Magma) [a: n in [0..100] | IsPrime(a) where a is 4*n^2+2*n-1]; // _Vincenzo Librandi_, Jul 23 2012

%o (PARI) (for (n=0, 100, if (isprime (k=4*n^2+2*n-1), print1 (k, ", ")))); \\ _Vincenzo Librandi_, Jul 23 2012

%Y Cf. A155736, A155738, A125202.

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Jan 26 2009

%E Incorrect formula deleted by _N. J. A. Sloane_, Jun 16 2010

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Last modified June 22 20:54 EDT 2024. Contains 373608 sequences. (Running on oeis4.)