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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.

A263876 Numbers n such that n^2 + 1 has two distinct prime divisors less than n.

Table of values

n a(n)
1 7
2 18
3 38
4 41
5 68
6 70
7 182
8 239
9 500
10 682
11 776
12 800
13 1068
14 1710
15 1744
16 4030
17 4060
18 5604
19 5744
20 8119
21 12156
22 15006
23 16610
24 17684
25 21490
26 25294
27 26884
28 27590
29 32060
30 32150
31 37416
32 37520
33 45630
34 47321
35 58724
36 71264
37 84906
38 88526
39 98864
40 109054
41 109610
42 128766

List of values

[7, 18, 38, 41, 68, 70, 182, 239, 500, 682, 776, 800, 1068, 1710, 1744, 4030, 4060, 5604, 5744, 8119, 12156, 15006, 16610, 17684, 21490, 25294, 26884, 27590, 32060, 32150, 37416, 37520, 45630, 47321, 58724, 71264, 84906, 88526, 98864, 109054, 109610, 128766]

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

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