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.

A227936 Triangular numbers which become primes when their rightmost digit is removed.

Table of values

n a(n)
1 21
2 28
3 36
4 55
5 78
6 136
7 171
8 190
9 231
10 378
11 435
12 595
13 1035
14 1275
15 1378
16 2278
17 2415
18 2775
19 4095
20 5778
21 5995
22 7875
23 8778
24 10878
25 11175
26 11935
27 14535
28 14878
29 21115
30 26335
31 27495
32 31375
33 31878
34 36315
35 37675
36 42195
37 47895
38 52975
39 55278
40 60378
41 66795
42 68635
43 75078

List of values

[21, 28, 36, 55, 78, 136, 171, 190, 231, 378, 435, 595, 1035, 1275, 1378, 2278, 2415, 2775, 4095, 5778, 5995, 7875, 8778, 10878, 11175, 11935, 14535, 14878, 21115, 26335, 27495, 31375, 31878, 36315, 37675, 42195, 47895, 52975, 55278, 60378, 66795, 68635, 75078]

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

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