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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.

A309886 a(n) is the smallest number that cannot be obtained from the first n powers of two {2^0,2^1,...,2^(n-1)} using each power exactly once and the operations +,-,*,/. Parentheses are allowed.

Table of values

n a(n)
1 2
2 4
3 11
4 27
5 77
6 597
7 2473
8 9643

List of values

[2, 4, 11, 27, 77, 597, 2473, 9643]

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

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