A074867 - cp's OEIS frontend

A074867 a(n) = M(a(n-1)) + M(a(n-2)) where a(1)=a(2)=1 and M(k) is the product of the digits of k in base 10.

n	a(n)
1	1
2	1
3	2
4	3
5	5
6	8
7	13
8	11
9	4
10	5
11	9
12	14
13	13
14	7
15	10
16	7
17	7
18	14
19	11
20	5
21	6
22	11
23	7
24	8
25	15
26	13
27	8
28	11
29	9
30	10
31	9
32	9
33	18
34	17
35	15
36	12
37	7
38	9
39	16
40	15
41	11
42	6
43	7
44	13
45	10
46	3
47	3
48	6
49	9
50	15
51	14
52	9
53	13
54	12
55	5
56	7
57	12
58	9
59	11
60	10
61	1
62	1
63	2
64	3
65	5
66	8
67	13
68	11
69	4
70	5
71	9
72	14
73	13
74	7
75	10
76	7
77	7
78	14
79	11
80	5
81	6
82	11
83	7
84	8
85	15
86	13

[1, 1, 2, 3, 5, 8, 13, 11, 4, 5, 9, 14, 13, 7, 10, 7, 7, 14, 11, 5, 6, 11, 7, 8, 15, 13, 8, 11, 9, 10, 9, 9, 18, 17, 15, 12, 7, 9, 16, 15, 11, 6, 7, 13, 10, 3, 3, 6, 9, 15, 14, 9, 13, 12, 5, 7, 12, 9, 11, 10, 1, 1, 2, 3, 5, 8, 13, 11, 4, 5, 9, 14, 13, 7, 10, 7, 7, 14, 11, 5, 6, 11, 7, 8, 15, 13]

cp's OEIS Frontend

A074867 a(n) = M(a(n-1)) + M(a(n-2)) where a(1)=a(2)=1 and M(k) is the product of the digits of k in base 10.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	3
5	5
6	8
7	13
8	11
9	4
10	5
11	9
12	14
13	13
14	7
15	10
16	7
17	7
18	14
19	11
20	5
21	6
22	11
23	7
24	8
25	15
26	13
27	8
28	11
29	9
30	10
31	9
32	9
33	18
34	17
35	15
36	12
37	7
38	9
39	16
40	15
41	11
42	6
43	7
44	13
45	10
46	3
47	3
48	6
49	9
50	15
51	14
52	9
53	13
54	12
55	5
56	7
57	12
58	9
59	11
60	10
61	1
62	1
63	2
64	3
65	5
66	8
67	13
68	11
69	4
70	5
71	9
72	14
73	13
74	7
75	10
76	7
77	7
78	14
79	11
80	5
81	6
82	11
83	7
84	8
85	15
86	13

n	a(n)
1	1
2	1
3	2
4	3
5	5
6	8
7	13
8	11
9	4
10	5
11	9
12	14
13	13
14	7
15	10
16	7
17	7
18	14
19	11
20	5
21	6
22	11
23	7
24	8
25	15
26	13
27	8
28	11
29	9
30	10
31	9
32	9
33	18
34	17
35	15
36	12
37	7
38	9
39	16
40	15
41	11
42	6
43	7
44	13
45	10
46	3
47	3
48	6
49	9
50	15
51	14
52	9
53	13
54	12
55	5
56	7
57	12
58	9
59	11
60	10
61	1
62	1
63	2
64	3
65	5
66	8
67	13
68	11
69	4
70	5
71	9
72	14
73	13
74	7
75	10
76	7
77	7
78	14
79	11
80	5
81	6
82	11
83	7
84	8
85	15
86	13

n	a(n)
1	1
2	1
3	2
4	3
5	5
6	8
7	13
8	11
9	4
10	5
11	9
12	14
13	13
14	7
15	10
16	7
17	7
18	14
19	11
20	5
21	6
22	11
23	7
24	8
25	15
26	13
27	8
28	11
29	9
30	10
31	9
32	9
33	18
34	17
35	15
36	12
37	7
38	9
39	16
40	15
41	11
42	6
43	7
44	13
45	10
46	3
47	3
48	6
49	9
50	15
51	14
52	9
53	13
54	12
55	5
56	7
57	12
58	9
59	11
60	10
61	1
62	1
63	2
64	3
65	5
66	8
67	13
68	11
69	4
70	5
71	9
72	14
73	13
74	7
75	10
76	7
77	7
78	14
79	11
80	5
81	6
82	11
83	7
84	8
85	15
86	13