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.

A080497 a(n) = (n-p_1)(n-p_2)...(n-p_k) where p_k is the k-th prime and is also the largest prime < n.

Table of values

n a(n)
1 1
2 1
3 1
4 2
5 6
6 12
7 40
8 90
9 336
10 840
11 1728
12 3150
13 10560
14 24948
15 99840
16 270270
17 604800
18 1201200
19 4386816
20 11277630
21 49029120
22 143896500
23 348364800
24 746876130
25 2937876480
26 8117240040
27 18923520000
28 39628338750
29 76859228160
30 140548508100

List of values

[1, 1, 1, 2, 6, 12, 40, 90, 336, 840, 1728, 3150, 10560, 24948, 99840, 270270, 604800, 1201200, 4386816, 11277630, 49029120, 143896500, 348364800, 746876130, 2937876480, 8117240040, 18923520000, 39628338750, 76859228160, 140548508100]

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

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