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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.

A359491 Numbers k with the property that the set of decimal digits of k matches the set of first digits of the prime factors of k.

Table of values

n a(n)
1 2
2 3
3 5
4 7
5 333
6 23532
7 33165
8 77322
9 175175
10 232152
11 321372
12 373212
13 515375
14 712236
15 2249232
16 2321232
17 2971332
18 3372138
19 3611322
20 4313331
21 5773131
22 12322332
23 23147124
24 42323112
25 72325232
26 113338575
27 123221232
28 132232224
29 172232112
30 212322912
31 221437272
32 273233331

List of values

[2, 3, 5, 7, 333, 23532, 33165, 77322, 175175, 232152, 321372, 373212, 515375, 712236, 2249232, 2321232, 2971332, 3372138, 3611322, 4313331, 5773131, 12322332, 23147124, 42323112, 72325232, 113338575, 123221232, 132232224, 172232112, 212322912, 221437272, 273233331]

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

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