cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A211771 Nonprime numbers with distinct digits in ascending order.

Original entry on oeis.org

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
Offset: 1

Views

Author

Jaroslav Krizek, May 07 2012

Keywords

Comments

Sequence is finite with 411 terms, last term is a(411) = 123456789.
Complement of A052015 with respect to A009993. Supersequence of A211772.

Links

Crossrefs

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).

Programs

  • Mathematica
    nnddQ[n_]:=!PrimeQ[n]&&Max[DigitCount[n]]<2&&Min[Differences[ IntegerDigits[ n]]]>0; Select[Range[300],nnddQ] (* Harvey P. Dale, Sep 27 2020 *)

Formula

A178788(a(n)) = 1.
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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