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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.

A242115 Woodall semiprimes: Semiprimes of the form n*2^n - 1.

Table of values

n a(n)
1 159
2 895
3 2047
4 4607
5 10239
6 49151
7 4718591
8 20971519
9 838860799
10 137438953471
11 5085241278463
12 21440476741631
13 340010386766614455386111
14 96714065569170333976494079
15 3288278229351791355200798719
16 111414603535684224740921180159
17 15370263527767281493147526365183

List of values

[159, 895, 2047, 4607, 10239, 49151, 4718591, 20971519, 838860799, 137438953471, 5085241278463, 21440476741631, 340010386766614455386111, 96714065569170333976494079, 3288278229351791355200798719, 111414603535684224740921180159, 15370263527767281493147526365183]

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

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