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.

A219017 Smallest number k such that k^2 - 1 has exactly n distinct prime factors.

Table of values

n a(n)
1 2
2 4
3 11
4 29
5 131
6 419
7 1429
8 14629
9 77141
10 509081
11 1456729
12 22486309
13 117048931
14 1625292241
15 10326137821
16 117440297701
17 1110819807371
18 8678298841211
19 138645880242871
20 980010587880169

List of values

[2, 4, 11, 29, 131, 419, 1429, 14629, 77141, 509081, 1456729, 22486309, 117048931, 1625292241, 10326137821, 117440297701, 1110819807371, 8678298841211, 138645880242871, 980010587880169]

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

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