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 A330159 #11 Dec 07 2019 00:39:42 %S A330159 91711,91712,141691,151481,161271,271161,1310812,5020232,10117443, %T A330159 11552816,14118522,14149412,14821815,31410828,35523710,41113743, %U A330159 46211402,84404483,91186117 %N A330159 The self-repeating start values of the iterative sequence A328680. %C A330159 This sequences lists the self-repeating starting values n for the iterative sequence defined in A328680 up to starting values of n = 10^8. Each number in this sequence, when acting as the starting value for the A328680 iteration, will be the first number repeated in the iteration. Note that the other numbers appearing in the iterative sequence for a given start value n will in general NOT be other entries of this sequence as the iteration depends critically on the start value of n itself. As can be seen these numbers are quite rare, there being only 19 entries for n up to 100 million. It is unknown if this is a finite or infinite sequence. %e A330159 91711 is in the sequence as A040115(91711) = 8660, A053392(8660) = 14126, A053392(14126) = 5538, A053392(5538) = 10811, A053392(10811) = 1892, A053392(1892) = 91711, repeating the starting value 91711. %Y A330159 Cf. A328680, A329624, A329623, A053392, A328975, A329200, A040115, A329197. %K A330159 nonn,base %O A330159 1,1 %A A330159 _Scott R. Shannon_, Dec 03 2019