OFFSET
1,2
COMMENTS
This is conjectured to be a permutation of the integers > 0.
LINKS
Carole Dubois, Table of n, a(n) for n = 1..5000
EXAMPLE
a(1) = 1 has digitsum 1, and this 1 ends a(2) = 11;
a(2) = 11 has digitsum 2 and this 2 ends a(3) = 2;
a(3) = 2 has digitsum 2 and this 2 ends a(4) = 12;
a(4) = 12 has digitsum 3 and this 3 ends a(5) = 3;
a(5) = 3 has digitsum 3 and this 3 ends a(6) = 13;
...
a(18) = 19 has digitsum 10 and this 10 ends a(19) = 10;
a(19) = 10 has digitsum 1 and this 1 ends a(20) = 21 (as 1 and 11 are already in the sequence); etc.
CROSSREFS
KEYWORD
AUTHOR
Carole Dubois and Eric Angelini, Mar 01 2020
STATUS
approved