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.

A162948 Numbers with a sum of digits equal to their smallest prime factor.

Table of values

n a(n)
1 2
2 3
3 5
4 7
5 20
6 21
7 110
8 111
9 133
10 200
11 201
12 209
13 247
14 407
15 481
16 511
17 629
18 803
19 1010
20 1011
21 1100
22 1101
23 1141
24 1387
25 1417
26 1651
27 1679
28 1853
29 2000
30 2001
31 2023
32 2119
33 2159
34 2353
35 2401
36 2771
37 3031
38 3077
39 3097
40 3383
41 3439
42 3523
43 3749
44 3781
45 4577
46 4607
47 4913
48 5149
49 5161

List of values

[2, 3, 5, 7, 20, 21, 110, 111, 133, 200, 201, 209, 247, 407, 481, 511, 629, 803, 1010, 1011, 1100, 1101, 1141, 1387, 1417, 1651, 1679, 1853, 2000, 2001, 2023, 2119, 2159, 2353, 2401, 2771, 3031, 3077, 3097, 3383, 3439, 3523, 3749, 3781, 4577, 4607, 4913, 5149, 5161]

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

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