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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.

A084716 a(1) = 1, a(n) = smallest multiple of a(n-1) > a(n-1) such that a(n) + 1 is a prime.

Table of values

n a(n)
1 1
2 2
3 4
4 12
5 36
6 72
7 432
8 1296
9 2592
10 10368
11 72576
12 508032
13 1524096
14 12192768
15 73156608
16 146313216
17 438939648
18 2633637888
19 23702740992
20 142216445952
21 1991030243328
22 37829574623232
23 416125320855552
24 1664501283422208
25 6658005133688832
26 126502097540087808

List of values

[1, 2, 4, 12, 36, 72, 432, 1296, 2592, 10368, 72576, 508032, 1524096, 12192768, 73156608, 146313216, 438939648, 2633637888, 23702740992, 142216445952, 1991030243328, 37829574623232, 416125320855552, 1664501283422208, 6658005133688832, 126502097540087808]

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

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