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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.

A379344 a(n) is the sum of all numbers k such that the greatest prime factor of k^2 - 1 is prime(n).

Table of values

n a(n)
1 3
2 31
3 310
4 15055
5 30433
6 318914
7 1378856
8 41139929
9 29628346
10 706390476
11 5330866189
12 17573061167
13 227644494516
14 912323845104
15 3312744735567
16 6366920047986
17 69033389180772
18 89835379146224
19 45938747179900
20 564448183072697
21 6856082910702485
22 19187647510345764511
23 56226662050090628
24 357824287346707561
25 139924756071743686

List of values

[3, 31, 310, 15055, 30433, 318914, 1378856, 41139929, 29628346, 706390476, 5330866189, 17573061167, 227644494516, 912323845104, 3312744735567, 6366920047986, 69033389180772, 89835379146224, 45938747179900, 564448183072697, 6856082910702485, 19187647510345764511, 56226662050090628, 357824287346707561, 139924756071743686]

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

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