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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.

A332991 a(n) is the smallest prime power p^k (p prime, k >= 1) such that sum of reciprocals of prime powers up to p^k (prime power harmonic sum) exceeds n.

Table of values

n a(n)
0 2
1 4
2 19
3 1307
4 266655247

List of values

[2, 4, 19, 1307, 266655247]

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

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