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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.

A281140 Least k such that k is the product of n distinct primes and sigma(k) is an n-th power.

Table of values

n a(n)
1 2
2 22
3 102
4 510
5 90510
6 995610
7 11616990
8 130258590
9 1483974030
10 18404105922510
11 428454465915630
12 10195374973815570
13 240871269907008510
14 94467020965716904490370
15 4580445736068712946096430
16 7027383957579235221501981990
17 419420669769073022876839238610
18 24967450935148397377034326845390

List of values

[2, 22, 102, 510, 90510, 995610, 11616990, 130258590, 1483974030, 18404105922510, 428454465915630, 10195374973815570, 240871269907008510, 94467020965716904490370, 4580445736068712946096430, 7027383957579235221501981990, 419420669769073022876839238610, 24967450935148397377034326845390]

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

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