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 A323036 #22 Jan 04 2019 15:06:45 %S A323036 3,103,295,6955,6955,821582,1457055,191525093,570434346,10685448370, %T A323036 166717504076,329466468458 %N A323036 Let k be the decimal string formed by the first n digits of Pi after the decimal point; a(n) is the position where the second occurrence of k begins. %C A323036 By definition, k occurs at digit place 1 in the decimal expansion of Pi. This sequence returns the digit place of the next occurrence of k. The first 1000 billion digits of Pi where scanned to find the 3 additional terms. %H A323036 Peter Treub, <a href="https://archive.org/download/pi_dec_1t">1000 billion digits of Pi</a>, at Archive.org site. [_Simon Plouffe_, Jan 04 2019] %e A323036 The decimal expansion of Pi begins: 3.1415926535897932384626433832795... . %e A323036 The second occurrence of 1 is at the third position, so a(1) = 3. %e A323036 The second occurrence of 14 is at position 103, so a(2) = 103. %e A323036 The second occurrence of 141 is at position 295, so a(3) = 295. %Y A323036 Cf. A000796. %K A323036 nonn,base,more %O A323036 1,1 %A A323036 _Paul S Cuckoo_, Jan 02 2019 %E A323036 a(10)-a(12) from _Simon Plouffe_, Jan 04 2018