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 A258481 #33 May 25 2024 18:33:18 %S A258481 1,3,9,48,4,8,9,9,6,5,5,0,28,70,0,89,11,48,5,8,7,8,53,3,0,26,4,6,5,9, %T A258481 5,8,26,3,6,20,9,1,3,43,6,86,43,4,0,0,80,7,4,4,9,1,3,86,4,77,4,70,8, %U A258481 74,4,2,7,6,9,88,74,7,57,8,4,0,0,28,4,62,3,4,170,6,69,87,2 %N A258481 Whole number sieve of Phi. %H A258481 Manfred Scheucher, <a href="/A258481/b258481.txt">Table of n, a(n) for n = 1..550</a> %H A258481 Manfred Scheucher, <a href="/A258481/a258481.sage.txt">Sage Script</a>. %e A258481 Find the first occurrence of 0 (the first whole number) in the digits of Phi (only 35 digits in this illustration): %e A258481 16180339887498948482045868343656381..., and replace it with a space: %e A258481 1618 339887498948482045868343656381... Repeat the process with the next whole number, 1: %e A258481 618 339887498948482045868343656381... Then 2: %e A258481 618 33988749894848 045868343656381... Then 3: %e A258481 618 3988749894848 045868343656381... Then 4,5,6,7, etc., until the first occurrence of every counting number is eliminated from the digits of Phi. %e A258481 1 3 9 48 04 8 ... Then consolidate gaps between the remaining digits into a single comma: %e A258481 1,3,9,48,4,8,9,9,6,5,5,0,28,70,0, ... to produce the first terms in the whole number sieve of Phi. %Y A258481 Cf. A001622, A247861, A247747, A257835, A258640. %K A258481 nonn,easy,base %O A258481 1,2 %A A258481 _Manfred Scheucher_, Jun 05 2015