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.

A239221 Numbers n such that n^3 is divisible by each of its nonzero digits.

Original entry on oeis.org

1, 2, 6, 10, 14, 20, 24, 42, 50, 60, 80, 100, 102, 126, 132, 140, 168, 180, 200, 202, 204, 210, 222, 234, 240, 246, 252, 270, 324, 342, 348, 350, 354, 360, 390, 396, 402, 420, 440, 450, 456, 462, 474, 480, 500, 504, 510, 522, 546, 552, 570, 588, 600, 612
Offset: 1

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Author

Colin Barker, Mar 12 2014

Keywords

Examples

			42 is in the sequence because 42^3 = 74088 which is divisible by 4, 7 and 8.
		

Crossrefs

Programs

  • Mathematica
    Select[Range[700],Union[PowerMod[#,3,IntegerDigits[#^3]/.(0-> Nothing)]] == {0}&] (* Harvey P. Dale, Jan 17 2021 *)
  • PARI
    isOK(n) = my(v=vecsort(digits(n^3), , 8)); for(i=1+(v[1]==0), #v, if(n^3%v[i], return(0))); 1
    s=[]; for(n=1, 1000, if(isOK(n), s=concat(s, n))); s