OFFSET
1,2
COMMENTS
If the result is nonzero, omit any leading zeros.
REFERENCES
GCHQ, The GCHQ Puzzle Book, Penguin, 2016. See page 50, Problem 95(b).
EXAMPLE
Delete 1 from 16 to get 6, then delete the 3 from 36 to get 6, and so on.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
N. J. A. Sloane, Apr 21 2023
STATUS
approved