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A211771
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Nonprime numbers with distinct digits in ascending order.
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2
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1, 4, 6, 8, 9, 12, 14, 15, 16, 18, 24, 25, 26, 27, 28, 34, 35, 36, 38, 39, 45, 46, 48, 49, 56, 57, 58, 68, 69, 78, 123, 124, 125, 126, 128, 129, 134, 135, 136, 138, 145, 146, 147, 148, 156, 158, 159, 168, 169, 178, 189, 234, 235, 236, 237, 238, 245, 246, 247
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OFFSET
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1,2
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COMMENTS
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Sequence is finite with 411 terms, last term is a(411) = 123456789.
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LINKS
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FORMULA
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MATHEMATICA
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nnddQ[n_]:=!PrimeQ[n]&&Max[DigitCount[n]]<2&&Min[Differences[ IntegerDigits[ n]]]>0; Select[Range[300], nnddQ] (* Harvey P. Dale, Sep 27 2020 *)
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CROSSREFS
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Cf. A052015 (primes with distinct digits in ascending order), A009993 (numbers with distinct digits in ascending order), A211772 (nonprime numbers all of whose divisors are numbers whose decimal digits are in ascending order).
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KEYWORD
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nonn,base,fini
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AUTHOR
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STATUS
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approved
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