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 A361131 #17 Mar 20 2025 14:42:17 %S A361131 1,4,11,18,25,26,28,44,47,59,63,80,81,101,108,114,125,135,148,151,153, %T A361131 162,172,187,198,205,206,223,229,234,237,256,268,274,279,294,297,304, %U A361131 322,335,338,355,374,381,387,393,401,433,438,439,443,446,447,472,484,491,495 %N A361131 Let d = A096567(n) be the first digit to appear n times in the decimal expansion of Pi; if d is the m-th digit of Pi, a(n) = m. %H A361131 Rémy Sigrist, <a href="/A361131/b361131.txt">Table of n, a(n) for n = 1..100359</a> %H A361131 Rémy Sigrist, <a href="/A361131/a361131.gp.txt">PARI program</a> %e A361131 Pi = 3.14159265358979323... %e A361131 The first digit to appear 4 times in Pi is 3, at the 18th digit, so a(4) = 18. %o A361131 (PARI) \\ See Links section. %Y A361131 Cf. A000796, A096567, A276992, A361434. %K A361131 nonn,base %O A361131 1,2 %A A361131 _N. J. A. Sloane_, Mar 11 2023