OFFSET
0,2
COMMENTS
In all of the terms, a digit '0' can only occur preceded by a digit '1', and an initial digit '1' can only appear followed by a '0'.
Sequence A216589 lists the complement of the range of this map.
This is an injective map, A216587 is its left inverse. - M. F. Hasler, Sep 09 2012
LINKS
Michael De Vlieger, Table of n, a(n) for n = 0..10000
E. Angelini, Strings resurrection, SeqFan mailing list, Sep 08 2012.
EXAMPLE
a(19) = concat(1+1,9+1) = 210.
MATHEMATICA
Array[FromDigits@ Flatten[IntegerDigits[#] + 1 /. 10 -> {1, 0}] &, 91, 0] (* Michael De Vlieger, Jan 04 2020 *)
PROG
(PARI) A216556(n)={my(t=1); until(n<t*=10, (n+=t)\t%10||n+=(n-t)\(t*=10)*9*t); n}
CROSSREFS
KEYWORD
nonn,easy,base
AUTHOR
M. F. Hasler, Sep 08 2012
STATUS
approved