A072144 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

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