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.

A115742 Triangular numbers whose digit reversal is a semiprime (A001358).

Table of values

n a(n)
1 6
2 15
3 28
4 55
5 78
6 105
7 120
8 190
9 496
10 780
11 903
12 946
13 1176
14 1225
15 1275
16 1540
17 1653
18 1770
19 1830
20 1891
21 2080
22 3081
23 3403
24 3486
25 3570
26 3741
27 3916
28 4186
29 4753
30 5050
31 5356
32 5671
33 6670
34 7021
35 7140
36 7381
37 7503
38 7626
39 8515
40 8911
41 9316
42 9591
43 9870

List of values

[6, 15, 28, 55, 78, 105, 120, 190, 496, 780, 903, 946, 1176, 1225, 1275, 1540, 1653, 1770, 1830, 1891, 2080, 3081, 3403, 3486, 3570, 3741, 3916, 4186, 4753, 5050, 5356, 5671, 6670, 7021, 7140, 7381, 7503, 7626, 8515, 8911, 9316, 9591, 9870]

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

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