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.

A217264 Numbers with 3 or more prime factors (with multiplicity) such that every concatenation of their prime factors is prime.

Table of values

n a(n)
1 63
2 549
3 657
4 833
5 1127
6 2009
7 3311
8 3971
9 4149
10 5043
11 5409
12 5491
13 10539
14 11493
15 13059
16 13941
17 14517
18 16839
19 17591
20 17991
21 18621
22 19133
23 20259
24 20781
25 21119
26 21249
27 21537
28 22023
29 23471
30 24183
31 25529
32 27181
33 30897
34 31653
35 32153
36 33271
37 33309
38 34227
39 35443

List of values

[63, 549, 657, 833, 1127, 2009, 3311, 3971, 4149, 5043, 5409, 5491, 10539, 11493, 13059, 13941, 14517, 16839, 17591, 17991, 18621, 19133, 20259, 20781, 21119, 21249, 21537, 22023, 23471, 24183, 25529, 27181, 30897, 31653, 32153, 33271, 33309, 34227, 35443]

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

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