The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A292846 Numbers n such that 11 iterations of 'Reverse and Subtract' lead to n, whereas fewer than 11 iterations do not lead to n. 10
 166425621223026859056339052269787863565428, 192910929628537040766341860254183960991698, 307567270506730945853551459962385036145286, 311906350108036145286307567270199935391877 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS There are 11 forty-two-digit terms in the sequence. Further terms are obtained (a) by inserting at the center of these terms either any number of 0's (for 166425621223026859056339052269787863565428, 311906350108036145286307567270199935391877, 466287189883036620417374974360601118217236, 658139747564935391877311906350534262959233, 703288139752915027377325180481642968027593) or any number of 9's (for the other six terms) and (b) by concatenating a term any number of times with itself and inserting an equal number of 0's at all junctures. Method (b) may be applied recursively to all terms. - Clarified by Ray Chandler, Oct 14 2017. LINKS Ray Chandler, Table of n, a(n) for n = 1..11 J. H. E. Cohn, Palindromic differences, Fibonacci Quart. 28 (1990), no. 2, 113-120. FORMULA n = f^11(n), n <> f^k(n) for k < 11, where f: x -> |x - reverse(x)|. EXAMPLE 166425621223026859056339052269787863565428 -> 658139747564935391877311906350534262959233 -> 325180485129881782763533712811068515027377 -> 448540030730236434571833574377853069054146 -> 192910929628537040766341860254183960991698 -> 703288139752915027377325180481642968027593 -> 307567270506730945853551459962385036145286 -> 374974360076539008301807089075220036620417 -> 339052269946031972406296711860450026859056 -> 311906350108036145286307567270199935391877 -> 466287189883036620417374974360601118217236 -> 166425621223026859056339052269787863565428. CROSSREFS Cf. A072142, A072143, A072718, A072719, A215669, A292634, A292635, A292856, A292857, A292858, A292859. Sequence in context: A120335 A095476 A292856 * A181789 A095478 A291353 Adjacent sequences:  A292843 A292844 A292845 * A292847 A292848 A292849 KEYWORD nonn,base AUTHOR Meritxell Vila Miñana, Sep 24 2017 EXTENSIONS Terms corrected by Ray Chandler, Sep 27 2017 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 21 11:28 EDT 2022. Contains 353908 sequences. (Running on oeis4.)