A249357 - cp's OEIS frontend

A249357 Fibonacci-Zumkeller numbers: a(n)=n if n<=3, otherwise the smallest number >= a(n-2) + a(n-1) having at least one common factor with a(n-2), but none with a(n-1).

n	a(n)
1	1
2	2
3	3
4	8
5	15
6	26
7	45
8	74
9	123
10	200
11	327
12	530
13	861
14	1396
15	2259
16	3656
17	5919
18	9578
19	15501
20	25082
21	40587
22	65672
23	106263
24	171938
25	278211
26	450151
27	728367
28	1178527
29	1906896
30	3085439
31	4992336
32	8077783
33	13070121
34	21147910
35	34218033
36	55365944
37	89583981
38	144949928
39	234533913
40	379483844
41	614017761
42	993501608

[1, 2, 3, 8, 15, 26, 45, 74, 123, 200, 327, 530, 861, 1396, 2259, 3656, 5919, 9578, 15501, 25082, 40587, 65672, 106263, 171938, 278211, 450151, 728367, 1178527, 1906896, 3085439, 4992336, 8077783, 13070121, 21147910, 34218033, 55365944, 89583981, 144949928, 234533913, 379483844, 614017761, 993501608]

cp's OEIS Frontend

A249357 Fibonacci-Zumkeller numbers: a(n)=n if n<=3, otherwise the smallest number >= a(n-2) + a(n-1) having at least one common factor with a(n-2), but none with a(n-1).

Table of values

List of values