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.

A307690 Integers with only one prime factor and whose Euler's totient is a perfect biquadrate.

Table of values

n a(n)
1 2
2 17
3 32
4 257
5 512
6 1297
7 8192
8 65537
9 131072
10 160001
11 331777
12 614657
13 1336337
14 1419857
15 2097152
16 4477457
17 5308417
18 8503057
19 9834497
20 29986577
21 33554432
22 40960001
23 45212177
24 59969537
25 65610001
26 126247697
27 193877777
28 303595777
29 384160001
30 406586897
31 536870912
32 562448657
33 655360001

List of values

[2, 17, 32, 257, 512, 1297, 8192, 65537, 131072, 160001, 331777, 614657, 1336337, 1419857, 2097152, 4477457, 5308417, 8503057, 9834497, 29986577, 33554432, 40960001, 45212177, 59969537, 65610001, 126247697, 193877777, 303595777, 384160001, 406586897, 536870912, 562448657, 655360001]

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

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