A177506 Primes of the form 4*10^n+1.

5, 41, 401, 4001, 40000000000001

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..9

Makoto Kamada, Prime numbers of the form 400...001.

Mathematica

Select[Table[4 10^n + 1, {n, 0, 500}], PrimeQ] (* Vincenzo Librandi Jan 02 2014 *)

Prog

(Magma) [a: n in [0..250] | IsPrime(a) where a is 4*10^n+1];

Crossrefs

Cf. A056806.

Sequence in context: A058475 A378957 A199684 * A064087 A329123 A375437

Adjacent sequences: A177503 A177504 A177505 * A177507 A177508 A177509

Keyword

nonn

Author

Vincenzo Librandi, Dec 11 2010

Status

approved