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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.

A305733 Heinz numbers of irreducible integer partitions. Nonprime numbers whose prime indices have a common divisor > 1 or such that A181819(n) is already in the sequence.

Table of values

n a(n)
1 1
2 9
3 21
4 25
5 27
6 36
7 39
8 49
9 57
10 63
11 65
12 81
13 87
14 91
15 100
16 111
17 115
18 117
19 121
20 125
21 129
22 133
23 144
24 147
25 159
26 169
27 171
28 183
29 185
30 189
31 196
32 203
33 213
34 216
35 225
36 235
37 237
38 243
39 247
40 259
41 261
42 267
43 273
44 289
45 299
46 301
47 303
48 305
49 319
50 321
51 324
52 325
53 333
54 339
55 343

List of values

[1, 9, 21, 25, 27, 36, 39, 49, 57, 63, 65, 81, 87, 91, 100, 111, 115, 117, 121, 125, 129, 133, 144, 147, 159, 169, 171, 183, 185, 189, 196, 203, 213, 216, 225, 235, 237, 243, 247, 259, 261, 267, 273, 289, 299, 301, 303, 305, 319, 321, 324, 325, 333, 339, 343]

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

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