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A043414
Numbers whose base-7 representation contains exactly two 5's.
0
40, 89, 138, 187, 236, 250, 257, 264, 271, 278, 280, 281, 282, 283, 284, 286, 292, 334, 383, 432, 481, 530, 579, 593, 600, 607, 614, 621, 623, 624, 625, 626, 627, 629, 635, 677, 726, 775, 824, 873, 922, 936, 943, 950, 957, 964
OFFSET
1,1
MATHEMATICA
Select[Range[1000], DigitCount[#, 7, 5]==2&] (* Harvey P. Dale, Apr 03 2011 *)
CROSSREFS
Cf. A007093.
Sequence in context: A203855 A188335 A185718 * A044178 A044559 A092613
KEYWORD
nonn,base
STATUS
approved