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.

A092561 "Mersenne" semiprimes, semiprimes of the form 2^k-1.

Table of values

n a(n)
1 15
2 511
3 2047
4 8388607
5 137438953471
6 2199023255551
7 562949953421311
8 576460752303423487
9 147573952589676412927
10 9671406556917033397649407
11 158456325028528675187087900671
12 2535301200456458802993406410751

List of values

[15, 511, 2047, 8388607, 137438953471, 2199023255551, 562949953421311, 576460752303423487, 147573952589676412927, 9671406556917033397649407, 158456325028528675187087900671, 2535301200456458802993406410751]

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

Content is available under The OEIS End-User License Agreement.