A242489 - cp's OEIS frontend

A242489 Smallest even k such that lpf(k-1) = prime(n), while lpf(k-3) > prime(n), where lpf=least prime factor (A020639).

n	a(n)
2	10
3	26
4	50
5	254
6	170
7	392
8	362
9	944
10	842
11	1892
12	1370
13	2420
14	1850
15	2210
16	3764
17	6314
18	3722
19	4892
20	5042
21	7082
22	8612
23	9380
24	7922
25	12320
26	11414
27	10610
28	11450
29	13844
30	18872
31	16130
32	17162
33	20414
34	19322
35	26672
36	24614
37	25592
38	29504
39	37910
40	29930
41	44930
42	36020
43	36482

[10, 26, 50, 254, 170, 392, 362, 944, 842, 1892, 1370, 2420, 1850, 2210, 3764, 6314, 3722, 4892, 5042, 7082, 8612, 9380, 7922, 12320, 11414, 10610, 11450, 13844, 18872, 16130, 17162, 20414, 19322, 26672, 24614, 25592, 29504, 37910, 29930, 44930, 36020, 36482]

cp's OEIS Frontend

A242489 Smallest even k such that lpf(k-1) = prime(n), while lpf(k-3) > prime(n), where lpf=least prime factor (A020639).

Table of values

List of values