OFFSET
1,1
COMMENTS
Here, the notation m' denotes the arithmetic derivative of m (A003415).
EXAMPLE
13 is in the sequence since 13 = 5 + 8 and 5' + 8' = 1 + 12 = 13, with 1 <= 5 <= 8.
25 is in the sequence since 25 = 5 + 20 and 5' + 20' = 1 + 24 = 25, with 1 <= 12 <= 14.
CROSSREFS
KEYWORD
nonn
AUTHOR
Wesley Ivan Hurt, Oct 09 2021
STATUS
approved