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 A065993 #6 Aug 02 2025 12:15:08
%S A065993 1,3,78
%N A065993 Numbers k such that the first k base-6 digits of Pi (A004605) expressed in decimal forms a prime.
%e A065993 The first 3 senary digits of Pi (A004605) are 305 = 113 in decimal, which is a prime.
%t A065993 Do[ If[ PrimeQ[ FromDigits[ First[ RealDigits[Pi, 6, n]], 6]], Print[n]], {n, 1, 2585} ]
%Y A065993 Cf. A004605.
%K A065993 base,bref,nonn,more
%O A065993 1,2
%A A065993 _Robert G. Wilson v_, Dec 10 2001