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.

A276564 Perfect powers k (exponent greater than 1) such that k-1 and k+1 are both semiprime.

Table of values

n a(n)
1 144
2 216
3 900
4 1764
5 2048
6 3600
7 10404
8 11664
9 39204
10 97344
11 213444
12 248832
13 272484
14 360000
15 656100
16 685584
17 1040400
18 1102500
19 1127844
20 1633284
21 2108304
22 2214144
23 3504384
24 3802500
25 4112784
26 4536900
27 4588164
28 5475600
29 7784100
30 7851204
31 8388608
32 8820900
33 9000000
34 9734400

List of values

[144, 216, 900, 1764, 2048, 3600, 10404, 11664, 39204, 97344, 213444, 248832, 272484, 360000, 656100, 685584, 1040400, 1102500, 1127844, 1633284, 2108304, 2214144, 3504384, 3802500, 4112784, 4536900, 4588164, 5475600, 7784100, 7851204, 8388608, 8820900, 9000000, 9734400]

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

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