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A173840
Primes of the form 10^n+2*n+1.
2
13, 10009, 1000000000000000000000049, 10000000000000000000000000000000000000000087
OFFSET
1,1
LINKS
MATHEMATICA
Select[Table[10^n + 2 n + 1, {n, 500}], PrimeQ] (* Vincenzo Librandi, Jan 03 2014 *)
PROG
(Magma) [a: n in [1..100] | IsPrime(a) where a is 10^n+2*n+1]; // Vincenzo Librandi, Jan 03 2014
CROSSREFS
Cf. A174178.
Sequence in context: A205162 A122429 A173506 * A260457 A219315 A068731
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Feb 26 2010
STATUS
approved