OFFSET
1,3
COMMENTS
10% of the nonnegative integers are in the sequence, approximatively.
LINKS
Jean-Marc Falcoz, Table of n, a(n) for n = 1..10001
EXAMPLE
The digital root of 10 is 1 and "1" is the first digit of "10", so 10 is in the sequence.
The digital root of 11 is 2 and "2" is not the first digit of "11", so 11 is not in the sequence.
The digital root of 19 is 1 and "1" is the first digit of "19", so 19 is in the sequence.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Eric Angelini and Jean-Marc Falcoz, Apr 12 2017
STATUS
approved