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A066640
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Numbers such that all divisors have only odd digits.
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1
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1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 31, 33, 35, 37, 39, 51, 53, 55, 57, 59, 71, 73, 77, 79, 91, 93, 95, 97, 99, 111, 113, 117, 119, 131, 133, 137, 139, 151, 153, 155, 157, 159, 171, 173, 177, 179, 191, 193, 197, 199
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| 77 = 11 * 7 belongs to this sequence but 75 does not as 25 (with a 2) divides 75.
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MATHEMATICA
| Select[Range[250], And@@OddQ/@Flatten[IntegerDigits/@Divisors[ # ]]&]
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CROSSREFS
| Not the same as A014261.
Sequence in context: A074775 A143451 A014261 * A137507 A061808 A143450
Adjacent sequences: A066637 A066638 A066639 * A066641 A066642 A066643
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KEYWORD
| nonn,base
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Dec 28 2001
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EXTENSIONS
| Corrected and extended by Harvey P. Dale (hpd1(AT)nyu.edu), Jan 01 2002
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