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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.

A083215 a(n) = 1 + Sum(prime(i)*(2*i-1): 1<=i<=n).

Table of values

n a(n)
1 3
2 12
3 37
4 86
5 185
6 328
7 549
8 834
9 1225
10 1776
11 2427
12 3278
13 4303
14 5464
15 6827
16 8470
17 10417
18 12552
19 15031
20 17800
21 20793
22 24190
23 27925
24 32108
25 36861
26 42012
27 47471
28 53356
29 59569
30 66236
31 73983
32 82236
33 91141
34 100454
35 110735
36 121456
37 132917

List of values

[3, 12, 37, 86, 185, 328, 549, 834, 1225, 1776, 2427, 3278, 4303, 5464, 6827, 8470, 10417, 12552, 15031, 17800, 20793, 24190, 27925, 32108, 36861, 42012, 47471, 53356, 59569, 66236, 73983, 82236, 91141, 100454, 110735, 121456, 132917]

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

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