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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.

A173631 a(n) = ceiling(sqrt(4*P_n)), where P_n is product of first n primes.

Table of values

n a(n)
0 2
1 3
2 5
3 11
4 29
5 97
6 347
7 1429
8 6229
9 29873
10 160869
11 895680
12 5448207
13 34885543
14 228759799
15 1568298164
16 11417382972
17 87698582661
18 684947826800
19 5606539592683
20 47241542317190
21 403631914492643
22 3587558929043911
23 32684217334320604
24 308342289648017960
25 3036819365023555974

List of values

[2, 3, 5, 11, 29, 97, 347, 1429, 6229, 29873, 160869, 895680, 5448207, 34885543, 228759799, 1568298164, 11417382972, 87698582661, 684947826800, 5606539592683, 47241542317190, 403631914492643, 3587558929043911, 32684217334320604, 308342289648017960, 3036819365023555974]

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

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