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A072961
Numbers using only the digits 2 and 5, that are both curved and straight.
11
2, 5, 22, 25, 52, 55, 222, 225, 252, 255, 522, 525, 552, 555, 2222, 2225, 2252, 2255, 2522, 2525, 2552, 2555, 5222, 5225, 5252, 5255, 5522, 5525, 5552, 5555, 22222, 22225, 22252, 22255, 22522, 22525, 22552, 22555, 25222, 25225, 25252, 25255
OFFSET
1,1
REFERENCES
M. J. Halm, Three Boxes, Puzzle-M Magazine (Apr. 1987).
LINKS
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
Sequence in context: A174143 A298762 A025559 * A249829 A042557 A137097
KEYWORD
easy,nonn,base
AUTHOR
Michael Joseph Halm, Aug 13 2002
STATUS
approved