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A068715
Primes of the form 10*3^k + 1.
3
11, 31, 271, 811, 21871, 196831, 5314411, 3874204891, 313810596091, 46383976865881019793281501678905914543189676980091, 2738927449953408337773479392637715347860807235997334411
OFFSET
1,1
LINKS
EXAMPLE
21871 is a member as it is a concatenation of 2187 (= 3^7) and 1.
MATHEMATICA
Select[Table[10*3^n+1, {n, 0, 300}], PrimeQ](* Vincenzo Librandi, Dec 08 2011 *)
PROG
(Magma) [a: n in [0..200] | IsPrime(a) where a is 10*3^n + 1]; // Vincenzo Librandi, Dec 08 2011
CROSSREFS
Sequence in context: A093382 A098264 A023279 * A093881 A328715 A163763
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Mar 05 2002
EXTENSIONS
More terms from Sascha Kurz, Mar 17 2002
STATUS
approved