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.

A278251 Least number with the prime signature of the n-th central polygonal number.

Table of values

n a(n)
0 1
1 1
2 2
3 2
4 2
5 6
6 2
7 2
8 6
9 2
10 6
11 6
12 6
13 2
14 6
15 2
16 2
17 30
18 2
19 8
20 6
21 2
22 2
23 12
24 6
25 2
26 30
27 6
28 2
29 6
30 6
31 12
32 6
33 6
34 2
35 6
36 6
37 6
38 30
39 2
40 6
41 6
42 2
43 6
44 6
45 6
46 6
47 30
48 6
49 6
50 30
51 2
52 6
53 6
54 6
55 2
56 30
57 6
58 2
59 30
60 2
61 6
62 30
63 2
64 6
65 30
66 6
67 2
68 60
69 12
70 2
71 6
72 2
73 6
74 6
75 30
76 2
77 6
78 2
79 2
80 60
81 2
82 30
83 6
84 6
85 6
86 6
87 6
88 30
89 30
90 2
91 2
92 6
93 6
94 6
95 30
96 6
97 6
98 6
99 6
100 2
101 210
102 2
103 30
104 6
105 6
106 2
107 30
108 30
109 6
110 30
111 2
112 2

List of values

[1, 1, 2, 2, 2, 6, 2, 2, 6, 2, 6, 6, 6, 2, 6, 2, 2, 30, 2, 8, 6, 2, 2, 12, 6, 2, 30, 6, 2, 6, 6, 12, 6, 6, 2, 6, 6, 6, 30, 2, 6, 6, 2, 6, 6, 6, 6, 30, 6, 6, 30, 2, 6, 6, 6, 2, 30, 6, 2, 30, 2, 6, 30, 2, 6, 30, 6, 2, 60, 12, 2, 6, 2, 6, 6, 30, 2, 6, 2, 2, 60, 2, 30, 6, 6, 6, 6, 6, 30, 30, 2, 2, 6, 6, 6, 30, 6, 6, 6, 6, 2, 210, 2, 30, 6, 6, 2, 30, 30, 6, 30, 2, 2]