1,1

Table of n, a(n) for n=1..75.

a(4) = 3 as concatenation of 3^4 and 1 = 811 is a prime. 161 is not a prime.

Do[k = 2; While[ !PrimeQ[10*k^n + 1], k++ ]; Print[k], {n, 1, 30}] (* Ryan Propper, Jul 08 2005 *)

Cf. A089318.

Sequence in context: A058680 A070544 A087713 * A140396 A117231 A106151

Adjacent sequences: A089316 A089317 A089318 * A089320 A089321 A089322

base,nonn

Amarnath Murthy, Nov 03 2003

Corrected and extended by Ryan Propper, Jul 08 2005

Further terms from David Wasserman, Sep 09 2005

approved