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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.

A181413 a(n) is the smallest number such that a(n)^2 + 1 is divisible by A002144(1)* A002144(2)*...* A002144(n).

Table of values

n a(n)
1 2
2 8
3 47
4 2163
5 18543
6 241727
7 3101272
8 842894268
9 8245041748
10 521781374353
11 101476250977928
12 671795954794788
13 32126984574675193
14 425090834074746637
15 309609468228403885693
16 25836182225971546313682
17 38544366727563360743217
18 217758730168965028986551783
19 25789605237863389220212237968
20 309600287787935978580674202007

List of values

[2, 8, 47, 2163, 18543, 241727, 3101272, 842894268, 8245041748, 521781374353, 101476250977928, 671795954794788, 32126984574675193, 425090834074746637, 309609468228403885693, 25836182225971546313682, 38544366727563360743217, 217758730168965028986551783, 25789605237863389220212237968, 309600287787935978580674202007]

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

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