cp's OEIS Frontend

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.

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A072145 Numbers k such that the period of the 'Reverse and Subtract' trajectory of k is greater than 14.

Original entry on oeis.org

100000114412, 100000124422, 100000125522, 100000126622, 100000177959, 100000192292, 100000214413, 100000215513, 100000218813, 100000221123, 100000228823, 100000248843, 100000269963, 100000271173, 100000302204
Offset: 1

Views

Author

Klaus Brockhaus, Jun 24 2002

Keywords

Comments

'Reverse and Subtract' (cf. A072137) is defined by x -> |x - reverse(x)|.
Subsequence of A072144.

Examples

			100000114412 -> 114410885589 -> 871177128822 -> 642355357644 -> 195601804398 -> 697806302193 -> 306602693397 -> 486793513206 -> 115521884478 and 115521884478 as a term of A072143 is the first term of the periodic part of the trajectory of 100000114412, period is 22.

Crossrefs

Cf. A072137, A072140, A072142, A072143, A072144.

Extensions

Offset corrected by Sean A. Irvine, Sep 04 2024
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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