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

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

Offset

1,1

Comments

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

Subsequence of A072144.

Links

Table of n, a(n) for n=1..15.

Example

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.

Sequence in context: A017279 A017519 A017651 * A192108 A214702 A164935

Adjacent sequences: A072142 A072143 A072144 * A072146 A072147 A072148

Keyword

base,nonn

Author

Klaus Brockhaus, Jun 24 2002

Extensions

Offset corrected by Sean A. Irvine, Sep 04 2024

Status

approved