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A177506
Primes of the form 4*10^n+1.
2
5, 41, 401, 4001, 40000000000001
OFFSET
1,1
LINKS
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 A386266 A329123
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Dec 11 2010
STATUS
approved