cp's OEIS Frontend

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.

A002223 Smallest prime p of form p = 8k-1 such that first n primes (p_1=2, ..., p_n) are quadratic residues mod p.

Table of values

n a(n)
1 7
2 23
3 71
4 311
5 479
6 1559
7 5711
8 10559
9 18191
10 31391
11 366791
12 366791
13 366791
14 4080359
15 12537719
16 30706079
17 36415991
18 82636319
19 120293879
20 120293879
21 131486759
22 131486759
23 2929911599
24 2929911599
25 7979490791
26 33857579279

List of values

[7, 23, 71, 311, 479, 1559, 5711, 10559, 18191, 31391, 366791, 366791, 366791, 4080359, 12537719, 30706079, 36415991, 82636319, 120293879, 120293879, 131486759, 131486759, 2929911599, 2929911599, 7979490791, 33857579279]

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

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