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.

A352546 Numbers having more even than odd digits when written in base 10.

Original entry on oeis.org

0, 2, 4, 6, 8, 20, 22, 24, 26, 28, 40, 42, 44, 46, 48, 60, 62, 64, 66, 68, 80, 82, 84, 86, 88, 100, 102, 104, 106, 108, 120, 122, 124, 126, 128, 140, 142, 144, 146, 148, 160, 162, 164, 166, 168, 180, 182, 184, 186, 188, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 212
Offset: 1

Views

Author

M. F. Hasler, Jul 03 2022

Keywords

Crossrefs

Cf. A072603 (same in base 2).
Cf. A117076 (subsequence of primes).
Cf. A352547 (numbers having more odd than even decimal digits).

Programs

  • Mathematica
    A352546Q[k_] := Length[#] > 2*Count[#, _?OddQ] & [IntegerDigits[k]];
    Select[Range[0, 300], A352546Q] (* Paolo Xausa, Nov 28 2024 *)
  • PARI
    select( {is_A352546(n)=vecsum(n=digits(n)%2)*2<#n+!n}, [0..222])
    
  • Python
    def ok(n): return len(s:=str(n)) < 2*sum(1 for c in s if c in "02468")
    print([k for k in range(213) if ok(k)]) # Michael S. Branicky, Jul 03 2022