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 A276686 #51 Aug 30 2017 14:46:32 %S A276686 3141,582,9999,2796,6549,2019,2916,8352,5485,5485,5485,5485,5485,5485, %T A276686 5485,1177,1177,5485,1177,3718,5485,5485,1766,1766,5485,4608,4608, %U A276686 4608,4608,4608,5485,5485,504,504,504,504,504,504,504,2103,504,504,9479,504,504 %N A276686 First 4-digit number to appear n times in the decimal expansion of Pi. %C A276686 Note that the sequence contains elements whose number of digits is less than 4. See example. %C A276686 The first 3 appearances of a(3) = 9999 overlap in 999999. %e A276686 a(2) = 582 because "0582" is the first 4-digit number to appear 2 times in the decimal expansion of Pi = 3.1415926535897932384626433832795028841971693993751(0582)097494459230781\ 640628620899862803482534211706798214808651328230664709384460955(0582)... %Y A276686 Cf. A000796, A096567, A276992, A276993, A277171, A290644, A291599, A291600. %K A276686 nonn,base %O A276686 1,1 %A A276686 _Bobby Jacobs_, Sep 25 2016 %E A276686 More terms from _Alois P. Heinz_, Oct 02 2016