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 A330159 The self-repeating start values of the iterative sequence A328680. 1
 91711, 91712, 141691, 151481, 161271, 271161, 1310812, 5020232, 10117443, 11552816, 14118522, 14149412, 14821815, 31410828, 35523710, 41113743, 46211402, 84404483, 91186117 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 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. LINKS Table of n, a(n) for n=1..19. EXAMPLE 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. CROSSREFS Cf. A328680, A329624, A329623, A053392, A328975, A329200, A040115, A329197. Sequence in context: A253932 A205940 A204881 * A202590 A116097 A116122 Adjacent sequences: A330156 A330157 A330158 * A330160 A330161 A330162 KEYWORD nonn,base AUTHOR Scott R. Shannon, Dec 03 2019 STATUS approved

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Last modified August 14 06:25 EDT 2024. Contains 375146 sequences. (Running on oeis4.)