OFFSET
1,1
REFERENCES
M. J. Halm, Three Boxes, Puzzle-M Magazine (Apr. 1987).
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..8190
MATHEMATICA
Flatten[Table[FromDigits/@Tuples[{2, 5}, n], {n, 5}]] (* Vincenzo Librandi, Aug 19 2016 *)
PROG
(Python)
from itertools import product
A072961_list = [int(''.join(a)) for l in range(1, 11) for a in product('25', repeat=l)] # Chai Wah Wu, May 12 2016
(Magma) [n: n in [1..30000] | Set(Intseq(n)) subset {2, 5}]; // Vincenzo Librandi, Aug 19 2016
CROSSREFS
KEYWORD
easy,nonn,base
AUTHOR
Michael Joseph Halm, Aug 13 2002
STATUS
approved