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.

A278799 Prime numbers that can be written as concatenation of two nonprimes in decimal representation.

Table of values

n a(n)
1 11
2 19
3 41
4 61
5 89
6 101
7 109
8 127
9 139
10 149
11 151
12 157
13 163
14 181
15 191
16 193
17 199
18 211
19 229
20 241
21 251
22 269
23 271
24 281
25 331
26 349
27 359
28 389
29 401
30 409
31 421
32 433
33 439
34 449
35 457
36 461
37 463
38 487
39 491
40 499
41 509
42 521
43 541
44 569
45 571
46 601
47 631
48 641
49 659
50 661
51 677
52 691
53 701
54 709
55 751
56 761
57 769
58 809

List of values

[11, 19, 41, 61, 89, 101, 109, 127, 139, 149, 151, 157, 163, 181, 191, 193, 199, 211, 229, 241, 251, 269, 271, 281, 331, 349, 359, 389, 401, 409, 421, 433, 439, 449, 457, 461, 463, 487, 491, 499, 509, 521, 541, 569, 571, 601, 631, 641, 659, 661, 677, 691, 701, 709, 751, 761, 769, 809]

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

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