A083153 a(1) = 7, a(n) = smallest nontrivial palindromic multiple of a(n-1). a(n) is not equal to a(n-1) or a concatenation of a(n-1) with itself.
7, 161, 1771, 161161, 1772771, 414828414, 4107216127014, 45179377397154, 410725719917527014, 210233245545545542332012, 210023222533245542335222320012, 21212345475857799775857454321212, 2100232225542478645885468742455222320012
Offset: 1
Links
- Giovanni Resta, Table of n, a(n) for n = 1..18
- P. De Geest, WONplate 36
Extensions
More terms from Patrick De Geest, Jun 05 2003
a(13) from Giovanni Resta, Sep 25 2019