This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A089318 #12 Mar 08 2025 08:46:54 %S A089318 31,41,271,811,77761,641,21871,16796161,196831,259374246011, %T A089318 19773267431,40961,9688901040700000000000001,163841, %U A089318 1368800680154120519681,1214395310965942517761,58744031063604200188795536431,3874204891,2748779069441,1757494343868923397049845066579063588307980412147890120011 %N A089318 Smallest prime of the form an n-th power followed by digit 1. %e A089318 a(4) = 811 is the prime which is the concatenation of 3^4 and 1. 161 is not a prime. %o A089318 (PARI) a(n) = my(k=2); while (!isprime(10*k^n+1), k++); 10*k^n+1; \\ _Michel Marcus_, Mar 08 2025 %Y A089318 Cf. A089319. %K A089318 base,nonn %O A089318 1,1 %A A089318 _Amarnath Murthy_, Nov 03 2003 %E A089318 More terms from _David Wasserman_, Sep 09 2005 %E A089318 Missing a(1) inserted and more terms from _Michel Marcus_, Mar 08 2025