A168253 - cp's OEIS frontend

A168253 a(n) is the smallest prime q such that, for the previous prime p and the following prime r, the fraction (q-p)/(r-q) has denominator n (or 0, if such a prime does not exist).

n	a(n)
1	5
2	3
3	23
4	89
5	139
6	199
7	113
8	1933
9	523
10	3089
11	1129
12	1669
13	2477
14	2971
15	4297
16	5591
17	1327
18	28351
19	30593
20	19333
21	16141
22	36389
23	81463
24	28229
25	31907
26	19609
27	35617
28	82073
29	44293
30	102701
31	34061
32	288583
33	221327
34	134513
35	173359
36	360091

[5, 3, 23, 89, 139, 199, 113, 1933, 523, 3089, 1129, 1669, 2477, 2971, 4297, 5591, 1327, 28351, 30593, 19333, 16141, 36389, 81463, 28229, 31907, 19609, 35617, 82073, 44293, 102701, 34061, 288583, 221327, 134513, 173359, 360091]

cp's OEIS Frontend

A168253 a(n) is the smallest prime q such that, for the previous prime p and the following prime r, the fraction (q-p)/(r-q) has denominator n (or 0, if such a prime does not exist).

Table of values

List of values