A072144 Numbers n such that the period length of the 'Reverse and Subtract' trajectory of n is greater than 2.

10001145, 10001827, 10002179, 10002289, 10002894, 10003037, 10003268, 10003378, 10004412, 10004698, 10006304, 10007624, 10007734, 10007965, 10008108, 10008713, 10008823, 10009175, 10009857, 10010022, 10010484

Offset

1,1

Comments

'Reverse and Subtract' (cf. A072137) is defined by x -> |x - reverse(x)|. - Subsequence of A072140.

Links

Table of n, a(n) for n=1..21.

Example

10001145 -> 44108856 -> 21771288 -> 66446424 -> 23981958 and 23981958 as a term of A072142 is the first term of the periodic part of the trajectory of 10001145, period length is 14.

Crossrefs

Cf. A072137, A072140, A072142, A072143, A072145.

Sequence in context: A017647 A182749 A260915 * A087510 A173002 A139120

Adjacent sequences: A072141 A072142 A072143 * A072145 A072146 A072147

Keyword

base,nonn

Author

Klaus Brockhaus, Jun 24 2002

Status

approved