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.

A074107 a(n) = Product of (prime + 1) for first n primes - primorial (n); Sum of proper divisors of the n-th primorial.

Table of values

n a(n)
0 0
1 1
2 6
3 42
4 366
5 4602
6 66738
7 1231314
8 25136790
9 612982650
10 18612572370
11 602072009070
12 23079296834790
13 976751205195990
14 43281303292150770
15 2090585319354906990
16 113506497027753468870
17 6842978980142398176930
18 426187457118982899608730
19 29098035465450244144376910
20 2102916875063497845451016610
21 156173789584825539524342644530

List of values

[0, 1, 6, 42, 366, 4602, 66738, 1231314, 25136790, 612982650, 18612572370, 602072009070, 23079296834790, 976751205195990, 43281303292150770, 2090585319354906990, 113506497027753468870, 6842978980142398176930, 426187457118982899608730, 29098035465450244144376910, 2102916875063497845451016610, 156173789584825539524342644530]

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

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