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.

A071837 Numbers k with the property that in the prime factorization of k all prime exponents are prime, their sum is also prime and equals the sum of distinct prime factors of k.

Table of values

n a(n)
1 4
2 27
3 72
4 108
5 800
6 3125
7 12500
8 247808
9 823543
10 22579200
11 37879808
12 190512000
13 266716800
14 428652000
15 529200000
16 600112800
17 868020300
18 1190700000
19 1234800000
20 1452124800
21 2420208000
22 2679075000
23 3267280800
24 3307500000
25 4984012800
26 6994132992
27 7351381800
28 7441875000
29 7717500000
30 9376762500

List of values

[4, 27, 72, 108, 800, 3125, 12500, 247808, 823543, 22579200, 37879808, 190512000, 266716800, 428652000, 529200000, 600112800, 868020300, 1190700000, 1234800000, 1452124800, 2420208000, 2679075000, 3267280800, 3307500000, 4984012800, 6994132992, 7351381800, 7441875000, 7717500000, 9376762500]

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

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