A092359 Let R_{k}(m) = the digit reversal of m in base k (R_{k}(m) is written in base 10). a(n) is the smallest y such that there are exactly n bases {k} (k >= 2 and (x < y)) solutions of the equation: R_{k}(x) = y and R_{k}(y) = x.

7, 19, 61, 193

Offset

1,1

Links

Table of n, a(n) for n=1..4.

Example

a(2)=19 because there are two solutions: R_{3}(11) = 19 and R_{3}(19) = 11, R_{9}(11) = 19 and R_{9}(19) = 11.

Crossrefs

Cf. A004086, A030101-A030108, A056960-A056963, A037183, A091974.

Sequence in context: A229442 A179406 A165683 * A259797 A155338 A155401

Adjacent sequences: A092356 A092357 A092358 * A092360 A092361 A092362

Keyword

more,nonn,base

Author

Naohiro Nomoto, Mar 18 2004

Status

approved