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.

A289665 Number of integers in the interval [2,A289663(n)] whose greatest prime factor is equal to the n-th popular prime A385503(n).

Table of values

n a(n)
1 4
2 14
3 25
4 77
5 151
6 428
7 616
8 1005
9 1517
10 2902
11 7664
12 7722
13 8284
14 48380
15 161644
16 698074
17 2761234
18 8357693
19 9758410
20 20285553
21 21123128
22 43031555
23 96835113
24 318539488
25 534261087
26 672081919
27 873949289
28 1997008416
29 2720040151
30 3321778833
31 3663025425
32 3924572413
33 7241174991

List of values

[4, 14, 25, 77, 151, 428, 616, 1005, 1517, 2902, 7664, 7722, 8284, 48380, 161644, 698074, 2761234, 8357693, 9758410, 20285553, 21123128, 43031555, 96835113, 318539488, 534261087, 672081919, 873949289, 1997008416, 2720040151, 3321778833, 3663025425, 3924572413, 7241174991]

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

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