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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.

A242116 Cullen semiprimes: Semiprimes of the form k*2^k + 1.

Table of values

n a(n)
1 9
2 25
3 65
4 161
5 2049
6 4609
7 22529
8 1048577
9 44040193
10 283467841537
11 1202590842881
12 256065421246102339102334047485953
13 4259306016766850789028922770063361
14 356615920533143509709616588588493085605889
15 57729314674570665269045550892293179276409335447553

List of values

[9, 25, 65, 161, 2049, 4609, 22529, 1048577, 44040193, 283467841537, 1202590842881, 256065421246102339102334047485953, 4259306016766850789028922770063361, 356615920533143509709616588588493085605889, 57729314674570665269045550892293179276409335447553]

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

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