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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A382027 Primes whose decimal digits are in ascending order and also parity alternating.

Original entry on oeis.org

2, 3, 5, 7, 23, 29, 47, 67, 89, 127, 149, 167, 347, 349, 367, 389, 569, 2347, 2389, 2789, 4567, 4789, 12347, 12569, 12589, 34589, 234589, 1234789, 1456789, 23456789
Offset: 1

Views

Author

Alois P. Heinz, Mar 12 2025

Keywords

Crossrefs

Intersection of A030144 and A052015.

Programs

  • Maple
    b:= proc(n) `if`(isprime(n), n, [][]), seq(b(10*n+j), j=irem(n, 10)+1..9, 2) end:
    {seq(b(n), n=1..9)}[];
  • Mathematica
    ad=Select[Prime[Range[2*10^6]],Union[IntegerDigits[#]]==IntegerDigits[#]&];fQ[n_] := Block[{m = Mod[ IntegerDigits@ n, 2]}, m == Split[m, UnsameQ][[1]]];Select[ad,fQ] (* James C. McMahon, Mar 20 2025 *)
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