A162151 Numbers n such that m=TITO(n)>n and TITO(m)=n, where TITO() = A161594().
12, 18, 24, 27, 36, 45, 48, 132, 144, 156, 198, 264, 276, 288, 291, 297, 372, 375, 396, 405, 492, 495, 528, 576, 1089, 1212, 1236, 1287, 1356, 1359, 1452, 1572, 1584, 1629, 1683, 1728, 1812, 1818, 2002, 2067, 2079, 2178, 2304, 2424, 2532, 2676, 2721, 2727
Offset: 1
Examples
For smaller n's, m is a reversal of n, but for larger n's, there are other cases as well:{12,21},{18,81},{24,42},{27,72},...,{291,732},...,{372,651}, etc.
Links
- Zak Seidov, 141 pairs {n,m} for n<30000
- T. Khovanova, Turning Numbers Inside Out [From _Tanya Khovanova_, Jul 07 2009]
Comments