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.

A052130 a(n) is the number of numbers between 1 and 2^m with m-n prime factors (counted with multiplicity), for m sufficiently large.

Table of values

n a(n)
0 1
1 2
2 7
3 15
4 37
5 84
6 187
7 421
8 914
9 2001
10 4283
11 9184
12 19611
13 41604
14 87993
15 185387
16 389954
17 817053
18 1709640
19 3567978
20 7433670
21 15460810
22 32103728
23 66567488
24 137840687
25 285076323
26 588891185
27 1215204568
28 2505088087
29 5159284087

List of values

[1, 2, 7, 15, 37, 84, 187, 421, 914, 2001, 4283, 9184, 19611, 41604, 87993, 185387, 389954, 817053, 1709640, 3567978, 7433670, 15460810, 32103728, 66567488, 137840687, 285076323, 588891185, 1215204568, 2505088087, 5159284087]

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

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