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A144162
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Numbers with at least two digits in which all digits except the rightmost are 0 or 5 and the rightmost is neither 0 nor 5.
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2
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51, 52, 53, 54, 56, 57, 58, 59, 501, 502, 503, 504, 506, 507, 508, 509, 551, 552, 553, 554, 556, 557, 558, 559, 5001, 5002, 5003, 5004, 5006, 5007, 5008, 5009, 5051, 5052, 5053, 5054, 5056, 5057, 5058, 5059, 5501, 5502, 5503, 5504, 5506, 5507, 5508, 5509, 5551
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OFFSET
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1,1
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COMMENTS
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These are called f-type numbers, cf. A163396.
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LINKS
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MATHEMATICA
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Flatten[Table[10#+r, {r, {1, 2, 3, 4, 6, 7, 8, 9}}]&/@FromDigits/@(Join[{5}, #]&/@ Flatten[ Table[Tuples[{0, 5}, f], {f, 0, 3}], 1])] (* Harvey P. Dale, Oct 18 2020 *)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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