A137530 Primes of the form 5k^2 + 1.

181, 1621, 6481, 8821, 35281, 52021, 58321, 87121, 103681, 112501, 131221, 141121, 151381, 172981, 184321, 302581, 380881, 414721, 450001, 486721, 544501, 626581, 691921, 737281, 784081, 808021, 1039681, 1067221, 1240021, 1300501, 1362421

Offset

1,1

Comments

All k are multiples of 6, k=6j, where j are numbers in A138218.

Links

Table of n, a(n) for n=1..31.

Mathematica

Select[5*Range[600]^2+1, PrimeQ] (* Harvey P. Dale, Dec 06 2015 *)

Prog

(Magma)[a: n in [0..1000]|IsPrime(a) where a is 1+5*n^2] // Vincenzo Librandi, Dec 13 2010

Crossrefs

Sequence in context: A163442 A268520 A235975 * A069763 A264289 A200953

Adjacent sequences: A137527 A137528 A137529 * A137531 A137532 A137533

Keyword

nonn

Author

Zak Seidov, Apr 27 2008

Status

approved