A221218 - cp's OEIS frontend

A221218 Let sequence B_n={b_m} be defined by: b_1=prime(n), b_2=prime(n+1); for m>=3, b_m=b_(m-2)+b_(m-1) if b_(m-2)+b_(m-1) is not semiprime, otherwise b_m is the least prime divisor of b_(m-2)+b_(m-1). Then a(n) is the maximal term of sequence B_n, or a(n)=0 if B_n is unbounded.

n	a(n)
1	570
2	570
3	570
4	570
5	19726
6	113750
7	570
8	22534
9	570
10	570
11	570
12	570
13	399610
14	570
15	570
16	570
17	3138
18	670
19	570
20	570
21	772
22	570
23	570
24	2448
25	109472
26	570
27	570
28	570
29	1150
30	609
31	18644
32	71049
33	2276
34	570
35	1634
36	1552
37	13844
38	798
39	68830
40	6940
41	575
42	1498
43	668
44	2551
45	1586
46	29729
47	1748
48	113750
49	19726
50	1435
51	194650
52	64360
53	3213
54	953988
55	9146
56	16539
57	811
58	8370238
59	516878
60	881
61	99942
62	7399
63	4160
64	215843
65	8397
66	676
67	13397
68	1715
69	915722
70	702
71	3572
72	141759
73	1192
74	1131
75	762
76	24895
77	1194
78	22534
79	1750
80	7069
81	68830

[570, 570, 570, 570, 19726, 113750, 570, 22534, 570, 570, 570, 570, 399610, 570, 570, 570, 3138, 670, 570, 570, 772, 570, 570, 2448, 109472, 570, 570, 570, 1150, 609, 18644, 71049, 2276, 570, 1634, 1552, 13844, 798, 68830, 6940, 575, 1498, 668, 2551, 1586, 29729, 1748, 113750, 19726, 1435, 194650, 64360, 3213, 953988, 9146, 16539, 811, 8370238, 516878, 881, 99942, 7399, 4160, 215843, 8397, 676, 13397, 1715, 915722, 702, 3572, 141759, 1192, 1131, 762, 24895, 1194, 22534, 1750, 7069, 68830]

cp's OEIS Frontend

A221218 Let sequence B_n={b_m} be defined by: b_1=prime(n), b_2=prime(n+1); for m>=3, b_m=b_(m-2)+b_(m-1) if b_(m-2)+b_(m-1) is not semiprime, otherwise b_m is the least prime divisor of b_(m-2)+b_(m-1). Then a(n) is the maximal term of sequence B_n, or a(n)=0 if B_n is unbounded.

Table of values

List of values