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.

A334069 Number of numbers <= 2^n that are the product of exactly four primes, not necessarily distinct.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 2
6 7
7 14
8 34
9 71
10 152
11 325
12 669
13 1405
14 2866
15 5931
16 12139
17 24782
18 50444
19 102458
20 207945
21 420511
22 850518
23 1716168
24 3460304
25 6968639
26 14022029
27 28189833
28 56631732
29 113697179
30 228115641
31 457456902
32 916899721
33 1836996851
34 3678943569
35 7365141297
36 14740076678
37 29490954290

List of values

[0, 0, 0, 1, 2, 7, 14, 34, 71, 152, 325, 669, 1405, 2866, 5931, 12139, 24782, 50444, 102458, 207945, 420511, 850518, 1716168, 3460304, 6968639, 14022029, 28189833, 56631732, 113697179, 228115641, 457456902, 916899721, 1836996851, 3678943569, 7365141297, 14740076678, 29490954290]

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

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