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 A127352 #11 Feb 16 2025 08:33:04 %S A127352 0,2000000000000000000000000002000000000000000000000002000000002202, %T A127352 2000000000000000000000000002000000000000000000000002000000002222, %U A127352 2000000000000000000000000002000000000000000000000002000000002223,2000000000000000000000000002000000000000000000000002000000002226,2000000000000000000000000002000000000000000000000002000000002227,2000000000000000000000000002000000000000000000000002000000002221 %N A127352 Integers less than 10^303 in reverse alphabetical order in U.S. English. %C A127352 Since the use of alphabetic names is rare for numbers greater than 10^15, there is no universal agreement on the naming scheme for large integers, and there is some question whether this sequence would well-defined without the "less than 10^303" clause. %C A127352 The Wikipedia article compares 8 dictionary sources and has names for the powers of 1000 up to 10^63 and for 10^303. These are also in the Mathworld link. %C A127352 There are several conflicting schemes for extending the dictionary definitions. If we assume that the system of alphabetic names greater than 10^63 defines a word for every power of 1000 and that word comes before "vigintillion" alphabetically, the sequence can include all integers. However, many of the extension schemes listed do not meet that standard - some have multiple words and some have words that are alphabetically after "vigintillion". %C A127352 For the powers of 1000 between 10^66 and 10^303, one source (http://www.mrob.com/pub/math/largenum.html) coins the name "vigintinonillion" for 10^90, but this format is inconsistent with other names listed in the same source, e.g. "duovigintillion", "sexoctogintillion". The name "novemvigintillion" seems to be more common. Otherwise, all sources have "vigintillion" as alphabetically last of all the powers of 1000 up to 10^303. %C A127352 The terms are from _Andrew Weimholt_. %H A127352 Michael B. Porter, <a href="/A127352/b127352.txt">Table of n, a(n) for n = 1..15</a> %H A127352 Robert P. Munafo, <a href="http://www.mrob.com/pub/math/largenum.html">Large numbers</a> %H A127352 Landon Curt Noll, <a href="http://www.isthe.com/chongo/tech/math/number/howhigh.html">How high can you count?</a> %H A127352 John J. G. Savard, <a href="http://www.quadibloc.com/math/bignum.htm">Some notes on big numbers</a> %H A127352 Gerard Schildberger, <a href="/a060365.txt">Lists of Words for the Numbers in A060365 and A060366</a> %H A127352 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/LargeNumber.html">Large Number</a> %H A127352 Wikipedia, <a href="http://en.wikipedia.org/wiki/Names_of_large_numbers">Names of large numbers</a> %e A127352 zero, %e A127352 two vigintillion two undecillion two trillion two thousand two hundred two, %e A127352 two vigintillion two undecillion two trillion two thousand two hundred twenty two, etc. %Y A127352 Cf. A004740, A019440, A060365, A060366. %Y A127352 See A026081 for another version. %K A127352 nonn,word,dumb %O A127352 1,2 %A A127352 _Michael B. Porter_, Nov 24 2009