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.

A071348 Intersection of A068017 and A068019: numbers n such that both sigma(n) and phi(n) are middle terms between (different) twin prime pairs.

Table of values

n a(n)
1 10
2 26
3 38
4 135
5 206
6 209
7 216
8 278
9 371
10 398
11 416
12 545
13 560
14 650
15 698
16 792
17 866
18 924
19 1062
20 1125
21 1286
22 1364
23 1403
24 1482
25 1512
26 1946
27 2021
28 2151
29 2306
30 2432
31 2516
32 2920
33 3040
34 3239
35 3263
36 3338
37 3363
38 3398
39 3443
40 3537
41 3758
42 3815
43 4028
44 4041
45 4058
46 4131

List of values

[10, 26, 38, 135, 206, 209, 216, 278, 371, 398, 416, 545, 560, 650, 698, 792, 866, 924, 1062, 1125, 1286, 1364, 1403, 1482, 1512, 1946, 2021, 2151, 2306, 2432, 2516, 2920, 3040, 3239, 3263, 3338, 3363, 3398, 3443, 3537, 3758, 3815, 4028, 4041, 4058, 4131]

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

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