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 A070854 #16 Dec 27 2024 13:02:41 %S A070854 11,101,3001,70001,700001,22000001,30000001,600000001,6000000001, %T A070854 30000000001,1900000000001,18000000000001,40000000000001, %U A070854 3900000000000001,6000000000000001,130000000000000001,3700000000000000001,15000000000000000001,150000000000000000001,600000000000000000001,16000000000000000000001 %N A070854 Smallest prime == 1 mod (10^n). %C A070854 a(6) through a(21) have been certified prime with Primo. - _Rick L. Shepherd_, Jun 03 2002 %F A070854 a(n) = A121172(n)*10^n + 1. - _Ray Chandler_, Feb 10 2009 %o A070854 (PARI) a(n)=for(i=1,+oo,if(isprime(i*10^n+1), return(i*10^n+1))) \\ _Johann Peters_, Dec 27 2024 %Y A070854 Cf. A070846 to A070853. %K A070854 nonn %O A070854 1,1 %A A070854 _Amarnath Murthy_, May 15 2002 %E A070854 More terms from _Rick L. Shepherd_, Jun 03 2002