

A073142


List of smallest solutions for some k of x = f^k(x), n <> f^j(n) for j < k, where f: m > m  reverse(m).


3




OFFSET

1,2


COMMENTS

In the definition, j can be restricted to proper divisors of k. A073143 gives the corresponding values of k. A073144(n) gives the smallest m such that the 'Reverse and Subtract' trajectory of m leads to a(n). Presumably a(6) = 1186781188132188 with k = 17.


LINKS

Table of n, a(n) for n=1..5.


EXAMPLE

a(3) = 11436678 is the smallest solution of x = f^14(x) and there is no k such that x = f^k(x) has a smallest solution between a(2) = 2178 and a(3).


CROSSREFS

Cf. A072137, A072141, A072142, A072143, A072718, A072719, A073143, A073144.
Sequence in context: A262792 A035770 A107566 * A137874 A137875 A020425
Adjacent sequences: A073139 A073140 A073141 * A073143 A073144 A073145


KEYWORD

base,more,nonn


AUTHOR

Klaus Brockhaus, Jul 17 2002


EXTENSIONS

Offset changed by N. J. A. Sloane, Dec 01 2007


STATUS

approved



