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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.

A339909 Carmichael numbers k for which bigomega(phi(k)) < bigomega(k-1), where bigomega gives the number of prime divisors, counted with multiplicity.

Table of values

n a(n)
1 1729
2 14676481
3 84350561
4 90698401
5 279377281
6 382536001
7 413138881
8 542497201
9 702683101
10 781347841
11 851703301
12 939947009
13 955134181
14 3480174001
15 4765950001
16 5255104513
17 5781222721
18 5985964801
19 7558388641
20 7816642561
21 8714965001
22 9237473281
23 13630072501
24 18189007201
25 21669076801
26 21863001601
27 23915494401
28 25477682491

List of values

[1729, 14676481, 84350561, 90698401, 279377281, 382536001, 413138881, 542497201, 702683101, 781347841, 851703301, 939947009, 955134181, 3480174001, 4765950001, 5255104513, 5781222721, 5985964801, 7558388641, 7816642561, 8714965001, 9237473281, 13630072501, 18189007201, 21669076801, 21863001601, 23915494401, 25477682491]

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

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