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.

A067715 Numbers k such that the sum of exponents in the prime factorization of k is < log(k).

Original entry on oeis.org

3, 5, 7, 9, 10, 11, 13, 14, 15, 17, 19, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 33, 34, 35, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 49, 50, 51, 52, 53, 55, 56, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 81, 82, 83, 84, 85, 86, 87, 88
Offset: 1

Views

Author

Leroy Quet, Feb 05 2002

Keywords

Examples

			9 is included because the sum of the exponents in the prime factorization of 9 is 2, which is < log(9).
		

Crossrefs

Cf. A067712.

Programs

  • Mathematica
    Select[Range[100],Total[Transpose[FactorInteger[#]][[2]]]Harvey P. Dale, Feb 01 2015 *)

Extensions

Definition extended and offset changed to 1 by Georg Fischer, Feb 01 2024