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.

A253204 a(1) = 1; for n>1, a(n) is a prime power p^h (h>=1) with the property that its k-th smallest divisor, for all 1 <= k <= tau(p^h), contains exactly k "1" digits in its binary representation.

Table of values

n a(n)
1 1
2 3
3 5
4 17
5 25
6 257
7 289
8 65537
9 66049
10 4295098369

List of values

[1, 3, 5, 17, 25, 257, 289, 65537, 66049, 4295098369]

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

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