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.

A325255 3-smooth numbers k such that k+1 and (k+2)/2 are prime.

Table of values

n a(n)
1 2
2 4
3 12
4 36
5 72
6 192
7 1152
8 2592
9 2916
10 1492992
11 1990656
12 5308416
13 28311552
14 6879707136
15 1761205026816
16 5566277615616
17 79164837199872
18 3799912185593856
19 115422332637413376
20 1332669751402954752
21 4803028329503971872

List of values

[2, 4, 12, 36, 72, 192, 1152, 2592, 2916, 1492992, 1990656, 5308416, 28311552, 6879707136, 1761205026816, 5566277615616, 79164837199872, 3799912185593856, 115422332637413376, 1332669751402954752, 4803028329503971872]

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

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