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 A367605 #26 Dec 12 2023 08:26:00 %S A367605 -1,76,6,15612,60466165,823512,262122,32,99999945,1771460,110,2052, %T A367605 289254654871,8649755859206,18446744073709551480,83264, %U A367605 1338258845052394702439737982907,893871504,10239999999942,1801088480,189,148035426,13501,244140456,3670344486987375 %N A367605 Final term of commas sequence (cf. A121805) if start at 1 and do the calculations in base n; or -1 if the sequence is infinite. %C A367605 a(n) is written here in base 10. In base n the values are more revealing: they are -1, 2211_3, 12_4, 444422_5, 5555555541_6, 6666624_7, 777752_8, 35_9, and 99999945_10. That is, they consist of a possibly empty string of digits b-1 followed by a pair of digits xy with x+y = b-1 (see the theorem in A367341). %Y A367605 Cf. A121805, A367341, A367604. %Y A367605 The sequences for bases 3, 8, and 10 are A367355, A367344, and A121805. %K A367605 sign %O A367605 2,2 %A A367605 _N. J. A. Sloane_, Dec 08 2023 %E A367605 More terms from _Michael S. Branicky_, Dec 08 2023