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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.

A382785 a(n) is the least multiple of the n-th primorial such that both a(n)-1 and a(n)+1 are prime and the prime factors of a(n) do not exceed prime(n).

Table of values

n a(n)
1 4
2 6
3 30
4 420
5 2310
6 180180
7 4084080
8 106696590
9 892371480
10 103515091680
11 4412330782860
12 29682952539240
13 22514519501013540
14 313986271960080720
15 22750921955774182170
16 912496437361321252440
17 26918644902158976946980
18 1290172194953476680815970
19 1901713815361424627522739780

List of values

[4, 6, 30, 420, 2310, 180180, 4084080, 106696590, 892371480, 103515091680, 4412330782860, 29682952539240, 22514519501013540, 313986271960080720, 22750921955774182170, 912496437361321252440, 26918644902158976946980, 1290172194953476680815970, 1901713815361424627522739780]

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

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