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.

User: Nile Nepenthe Wynar

Nile Nepenthe Wynar's wiki page.

Nile Nepenthe Wynar has authored 1 sequences.

A295389 Numbers whose sum of digits is squarefree.

Original entry on oeis.org

1, 2, 3, 5, 6, 7, 10, 11, 12, 14, 15, 16, 19, 20, 21, 23, 24, 25, 28, 29, 30, 32, 33, 34, 37, 38, 41, 42, 43, 46, 47, 49, 50, 51, 52, 55, 56, 58, 59, 60, 61, 64, 65, 67, 68, 69, 70, 73, 74, 76, 77, 78, 82, 83, 85, 86, 87, 89, 91, 92, 94, 95, 96, 98, 100, 101, 102, 104, 105, 106, 109, 110, 111, 113, 114
Offset: 1

Author

Nile Nepenthe Wynar, Nov 21 2017

Keywords

Comments

Numbers k such that A007953(k) is a term of A005117. - Felix Fröhlich, Nov 21 2017

Crossrefs

Cf. A005117, A007953. Includes A028834.

Programs

  • Maple
    select(n -> numtheory:-issqrfree(convert(convert(n,base,10),`+`)), [$1..200]); # Robert Israel, Nov 21 2017
  • PARI
    is(n) = issquarefree(sumdigits(n));
    for(n = 1, 200, if(is(n), print1(n,", ")))