OFFSET
1,1
COMMENTS
Let T(S,Q) be the sequence obtained by starting with S and repeatedly reversing the digits and adding Q to get the next term. This is T(100013,2). 100013 is the first S for which T(S,2) reaches a cycle of length 1890. The cycle is simply the first 1890 terms, which then repeat. A full period is given in the table.
LINKS
Klaus Brockhaus, Table of n, a(n) for n = 1..1890
N. J. A. Sloane and others, Sequences of RADD type, OEIS wiki.
MATHEMATICA
NestList[FromDigits[Reverse[IntegerDigits[#]]]+2&, 100013, 30] (* Harvey P. Dale, Oct 03 2014 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Klaus Brockhaus, Jun 11 2006
STATUS
approved