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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.

A240918 Primes p such that p +/- product_of_digits(p) are both semiprimes.

Table of values

n a(n)
1 211
2 257
3 269
4 461
5 463
6 467
7 523
8 547
9 769
10 829
11 839
12 947
13 967
14 983
15 1129
16 1213
17 1259
18 1327
19 1361
20 1381
21 1429
22 1433
23 1453
24 1487
25 1619
26 1667
27 1721
28 1723
29 1741
30 1811
31 1847
32 2143
33 2153
34 2161
35 2243
36 2251
37 2311
38 2339
39 2357
40 2371
41 2473
42 2531
43 2591
44 2593
45 2617
46 2659

List of values

[211, 257, 269, 461, 463, 467, 523, 547, 769, 829, 839, 947, 967, 983, 1129, 1213, 1259, 1327, 1361, 1381, 1429, 1433, 1453, 1487, 1619, 1667, 1721, 1723, 1741, 1811, 1847, 2143, 2153, 2161, 2243, 2251, 2311, 2339, 2357, 2371, 2473, 2531, 2591, 2593, 2617, 2659]

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

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