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A177506 Primes of the form 4*10^n+1. 2
5, 41, 401, 4001, 40000000000001 (list; graph; refs; listen; history; text; internal format)
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: A026000 A058475 A199684 * A064087 A329123 A285064

Adjacent sequences:  A177503 A177504 A177505 * A177507 A177508 A177509

KEYWORD

nonn

AUTHOR

Vincenzo Librandi, Dec 11 2010

STATUS

approved

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Last modified February 28 11:08 EST 2020. Contains 332323 sequences. (Running on oeis4.)