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.

A215218 Number of sphenic numbers, i.e., numbers with exactly three distinct prime factors, up to 10^n.

Table of values

n a(n)
1 0
2 5
3 135
4 1800
5 19919
6 206964
7 2086746
8 20710806
9 203834084
10 1997171674
11 19522428788
12 190614467420
13 1860310801454
14 18155356377267
15 177224592578839
16 1730651760050923
17 16908343191198752
18 165279853754232019
19 1616504757072680964

List of values

[0, 5, 135, 1800, 19919, 206964, 2086746, 20710806, 203834084, 1997171674, 19522428788, 190614467420, 1860310801454, 18155356377267, 177224592578839, 1730651760050923, 16908343191198752, 165279853754232019, 1616504757072680964]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.