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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.

A356766 Least number k such that k and k+2 both have exactly 2n divisors, or -1 if no such number exists.

Table of values

n a(n)
1 3
2 6
3 18
4 40
5 127251
6 198
7 26890623
8 918
9 17298
10 6640
11 25269208984375
12 3400
13 3900566650390623
14 640062
15 8418573
16 18088
17 1164385682220458984373
18 41650
19 69528379848480224609373
20 128464
21 34084859373
22 12164094
23 150509919493198394775390625
24 90270
25 418514293125
26 64505245696

List of values

[3, 6, 18, 40, 127251, 198, 26890623, 918, 17298, 6640, 25269208984375, 3400, 3900566650390623, 640062, 8418573, 18088, 1164385682220458984373, 41650, 69528379848480224609373, 128464, 34084859373, 12164094, 150509919493198394775390625, 90270, 418514293125, 64505245696]

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

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