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.

A378139 Smallest prime number such that the number of distinct prime factors with multiplicity of its 9's complement is equal to n. If no such number exists, return -1.

Table of values

n a(n)
1 2
2 3
3 23
4 11
5 19
6 263
7 167
8 103
9 487
10 1039
11 7951
12 5903
13 28319
14 107071
15 67231
16 590399
17 180799
18 344639
19 1480319
20 12181759
21 4757119
22 10871039
23 1611391
24 140167679
25 203082239
26 228248063
27 530237951
28 1812718591
29 5302379519
30 13295347711
31 12758476799
32 132953477119
33 1410065407

List of values

[2, 3, 23, 11, 19, 263, 167, 103, 487, 1039, 7951, 5903, 28319, 107071, 67231, 590399, 180799, 344639, 1480319, 12181759, 4757119, 10871039, 1611391, 140167679, 203082239, 228248063, 530237951, 1812718591, 5302379519, 13295347711, 12758476799, 132953477119, 1410065407]

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

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