OFFSET

2,4

COMMENTS

If there is a number m such that the reversal of m in base n is c times m, then c is called a reverse multiplier for n. For example, 2 is a reverse multiplier for base n=5, since 8 (base 10) = 13 (base 5), and 2*8 = 16 (base 10) = 31 (base 5).

The trivial reverse multiplier 1 is excluded.

LINKS

N. J. A. Sloane, Table of n, a(n) for n = 2..100

N. J. A. Sloane, 2178 And All That, Fib. Quart., 52 (2014), 99-120.

Anne Ludington Young, k-Reverse multiples, Fib. Q., 30 (1992), 126-132.

CROSSREFS

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Mar 13 2013

STATUS

approved