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.

A066902 Integers k such that phi(prime(k)+1) = phi(prime(k)-1).

Table of values

n a(n)
1 3
2 5
3 20
4 156
5 254
6 377
7 593
8 1800
9 5903
10 5981
11 7925
12 18669
13 19240
14 41274
15 48296
16 135700
17 146866
18 228028
19 234303
20 251216
21 407377
22 654288
23 802222
24 886223
25 938654
26 1063412
27 1072766
28 1212140
29 1238668
30 1515063
31 1609346
32 2080991
33 2097725
34 2363130
35 2408674
36 2916514

List of values

[3, 5, 20, 156, 254, 377, 593, 1800, 5903, 5981, 7925, 18669, 19240, 41274, 48296, 135700, 146866, 228028, 234303, 251216, 407377, 654288, 802222, 886223, 938654, 1063412, 1072766, 1212140, 1238668, 1515063, 1609346, 2080991, 2097725, 2363130, 2408674, 2916514]

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

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