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 A080597 #22 Feb 16 2025 08:32:48 %S A080597 33,607,8556,99850,1369565,14118313,166100507,1816743913,22445207407, %T A080597 241641121049,2512258603208 %N A080597 Number of terms from the decimal expansion of Pi (A000796) which include every combination of n digits as consecutive subsequences. %H A080597 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ConstantDigitScanning.html">Constant Digit Scanning</a> %H A080597 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PiDigits.html">Pi Digits</a> %F A080597 a(n) = A036903(n) + 1. - _Eric W. Weisstein_, Sep 11 2013 %e A080597 a(2) = 607 because the first 607 digits of Pi contain every conceivable 2-digit subsequence but the first 606 digits do not. The combination (6, 8) appears as 606th and 607th term in A000796. %Y A080597 Cf. A000796 (decimal expansion of Pi). %Y A080597 Cf. A036903 (= a(n) - 1). %Y A080597 Cf. A032510 (last digit string when scanning the decimal expansion of Pi for all n-digit strings). %K A080597 more,nonn,base %O A080597 1,1 %A A080597 Martin Hasch (martin(AT)mathematik.uni-ulm.de), Feb 23 2003 %E A080597 a(7)-a(8) from _Piotr Idzik_, Nov 01 2011 %E A080597 a(9)-a(11) from A036903(n) + 1 by _Eric W. Weisstein_, Sep 11 2013