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 A300397 #28 Mar 27 2018 05:51:18 %S A300397 1,24,245,2484,24967,249934,2499755,24999435,249997579,2499995131, %T A300397 24999983109,249999976990 %N A300397 a(n) = number of primes that end in 1 among the first 10^n primes. %F A300397 a(n) = A185705(A006988(n)). - _Michel Marcus_, Mar 20 2018 %e A300397 a(1) = 1 because the first 10 primes are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, among which there is only one prime ending in 1. %o A300397 (PARI) a(n) = #select(x->((x % 10) == 1), primes(10^n)); \\ _Michel Marcus_, Mar 07 2018 %Y A300397 Cf. A006988, A030430, A185705, A300398, A300399, A300400. %K A300397 nonn,base,more %O A300397 1,2 %A A300397 _G. L. Honaker, Jr._, Mar 05 2018 %E A300397 a(3)-a(8) from Chuck Gaydos %E A300397 a(9) from _Jon E. Schoenfield_, Mar 20 2018 %E A300397 a(10)-a(12) from _Giovanni Resta_, Mar 27 2018