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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.

A090987 a(n) is the smallest prime whose square divides the numerator of the Bernoulli number B(A090997(n)).

Table of values

n a(n)
1 5
2 7
3 5
4 7
5 103
6 11
7 5
8 37
9 13
10 5
11 7
12 5
13 11
14 7
15 5
16 17
17 5
18 13
19 7
20 19
21 11
22 5
23 7
24 5
25 59
26 5
27 11
28 7
29 13
30 5
31 23
32 7
33 5
34 17
35 37
36 5
37 7
38 5
39 13
40 7
41 271
42 19
43 5
44 11
45 5
46 7
47 37
48 5
49 7
50 29
51 13
52 11
53 17
54 5
55 5
56 7
57 31
58 11
59 5
60 7
61 5
62 23
63 5
64 7
65 19
66 11
67 5
68 7
69 17
70 5
71 13
72 5
73 103
74 37
75 7
76 5
77 59
78 5
79 11
80 13
81 37
82 7
83 5
84 7
85 5
86 131
87 19
88 17
89 11
90 37
91 5
92 7
93 13
94 5
95 7
96 11
97 5
98 23
99 5
100 67
101 7
102 5
103 41
104 29
105 13
106 11
107 7
108 5
109 17
110 5
111 19
112 7
113 5
114 43
115 13
116 7
117 5
118 31
119 37
120 5
121 11
122 67
123 7
124 5
125 7
126 17
127 5
128 11
129 5
130 7
131 23
132 5
133 37
134 7
135 19
136 59
137 5
138 11
139 13
140 47
141 5
142 7
143 5
144 11
145 7
146 5
147 13
148 5
149 7
150 5
151 7
152 5

List of values

[5, 7, 5, 7, 103, 11, 5, 37, 13, 5, 7, 5, 11, 7, 5, 17, 5, 13, 7, 19, 11, 5, 7, 5, 59, 5, 11, 7, 13, 5, 23, 7, 5, 17, 37, 5, 7, 5, 13, 7, 271, 19, 5, 11, 5, 7, 37, 5, 7, 29, 13, 11, 17, 5, 5, 7, 31, 11, 5, 7, 5, 23, 5, 7, 19, 11, 5, 7, 17, 5, 13, 5, 103, 37, 7, 5, 59, 5, 11, 13, 37, 7, 5, 7, 5, 131, 19, 17, 11, 37, 5, 7, 13, 5, 7, 11, 5, 23, 5, 67, 7, 5, 41, 29, 13, 11, 7, 5, 17, 5, 19, 7, 5, 43, 13, 7, 5, 31, 37, 5, 11, 67, 7, 5, 7, 17, 5, 11, 5, 7, 23, 5, 37, 7, 19, 59, 5, 11, 13, 47, 5, 7, 5, 11, 7, 5, 13, 5, 7, 5, 7, 5]

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

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