OFFSET
0,1
REFERENCES
J. J. Clessa, Micropuzzles, Pan Books, 1983, p. 31 (puzzle 51).
GCHQ, The GCHQ Puzzle Book, Penguin, 2016. See pages 108 and 300.
LINKS
Albert Franck, Puzzles, see item 4.
EXAMPLE
16 = 121_3, so a(13) = 121.
PROG
(PARI) a(n) = if (n <= 15, fromdigits(digits(16, 16-n), 10), 1111111111111111); \\ Michel Marcus, Aug 06 2017
CROSSREFS
KEYWORD
fini,nonn,base,full,nice
AUTHOR
STATUS
approved