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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.

A307453 a(n) is the least prime p for which the continued fraction expansion of sqrt(p) has exactly n consecutive 1's starting at position 2.

Table of values

n a(n)
0 2
1 3
2 31
3 7
4 13
5 3797
6 5273
7 4987
8 90371
9 79873
10 2081
11 111301
12 1258027
13 5325101
14 12564317
15 9477889
16 47370431
17 709669249
18 1529640443
19 2196104969
20 392143681
21 8216809361
22 30739072339
23 200758317433
24 370949963971
25 161356959383
26 1788677860531
27 7049166342469
28 4484287435283
29 3690992602753

List of values

[2, 3, 31, 7, 13, 3797, 5273, 4987, 90371, 79873, 2081, 111301, 1258027, 5325101, 12564317, 9477889, 47370431, 709669249, 1529640443, 2196104969, 392143681, 8216809361, 30739072339, 200758317433, 370949963971, 161356959383, 1788677860531, 7049166342469, 4484287435283, 3690992602753]

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

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