A094830 - cp's OEIS frontend

A094830 Start with x = n, repeatedly replace x with x + sum of squares of digits of x until you reach a prime; sequence gives number of steps.

n	a(n)
1	1
2	0
3	0
4	6
5	0
6	4
7	0
8	11
9	5
10	1
11	0
12	1
13	0
14	1
15	1
16	1
17	0
18	1
19	0
20	5
21	13
22	9
23	0
24	4
25	11
26	12
27	17
28	3
29	0
30	8
31	0
32	8
33	7
34	1
35	7
36	3
37	0
38	5
39	7
40	4
41	0
42	3
43	0
44	3
45	7
46	8
47	0
48	2
49	2
50	2
51	6
52	3
53	0
54	10
55	2
56	3
57	1
58	3
59	0
60	3
61	0
62	2
63	2
64	18
65	2
66	11
67	0
68	2
69	6
70	9
71	0
72	10
73	0
74	1
75	1
76	2
77	5
78	1
79	0
80	16
81	2
82	8
83	0
84	3
85	11
86	6
87	10
88	2
89	0
90	4
91	1
92	15
93	2
94	1
95	9
96	2
97	0
98	7
99	7
100	1

[1, 0, 0, 6, 0, 4, 0, 11, 5, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 5, 13, 9, 0, 4, 11, 12, 17, 3, 0, 8, 0, 8, 7, 1, 7, 3, 0, 5, 7, 4, 0, 3, 0, 3, 7, 8, 0, 2, 2, 2, 6, 3, 0, 10, 2, 3, 1, 3, 0, 3, 0, 2, 2, 18, 2, 11, 0, 2, 6, 9, 0, 10, 0, 1, 1, 2, 5, 1, 0, 16, 2, 8, 0, 3, 11, 6, 10, 2, 0, 4, 1, 15, 2, 1, 9, 2, 0, 7, 7, 1]

cp's OEIS Frontend

A094830 Start with x = n, repeatedly replace x with x + sum of squares of digits of x until you reach a prime; sequence gives number of steps.

Table of values

List of values

n	a(n)
1	1
2	0
3	0
4	6
5	0
6	4
7	0
8	11
9	5
10	1
11	0
12	1
13	0
14	1
15	1
16	1
17	0
18	1
19	0
20	5
21	13
22	9
23	0
24	4
25	11
26	12
27	17
28	3
29	0
30	8
31	0
32	8
33	7
34	1
35	7
36	3
37	0
38	5
39	7
40	4
41	0
42	3
43	0
44	3
45	7
46	8
47	0
48	2
49	2
50	2
51	6
52	3
53	0
54	10
55	2
56	3
57	1
58	3
59	0
60	3
61	0
62	2
63	2
64	18
65	2
66	11
67	0
68	2
69	6
70	9
71	0
72	10
73	0
74	1
75	1
76	2
77	5
78	1
79	0
80	16
81	2
82	8
83	0
84	3
85	11
86	6
87	10
88	2
89	0
90	4
91	1
92	15
93	2
94	1
95	9
96	2
97	0
98	7
99	7
100	1

n	a(n)
1	1
2	0
3	0
4	6
5	0
6	4
7	0
8	11
9	5
10	1
11	0
12	1
13	0
14	1
15	1
16	1
17	0
18	1
19	0
20	5
21	13
22	9
23	0
24	4
25	11
26	12
27	17
28	3
29	0
30	8
31	0
32	8
33	7
34	1
35	7
36	3
37	0
38	5
39	7
40	4
41	0
42	3
43	0
44	3
45	7
46	8
47	0
48	2
49	2
50	2
51	6
52	3
53	0
54	10
55	2
56	3
57	1
58	3
59	0
60	3
61	0
62	2
63	2
64	18
65	2
66	11
67	0
68	2
69	6
70	9
71	0
72	10
73	0
74	1
75	1
76	2
77	5
78	1
79	0
80	16
81	2
82	8
83	0
84	3
85	11
86	6
87	10
88	2
89	0
90	4
91	1
92	15
93	2
94	1
95	9
96	2
97	0
98	7
99	7
100	1

n	a(n)
1	1
2	0
3	0
4	6
5	0
6	4
7	0
8	11
9	5
10	1
11	0
12	1
13	0
14	1
15	1
16	1
17	0
18	1
19	0
20	5
21	13
22	9
23	0
24	4
25	11
26	12
27	17
28	3
29	0
30	8
31	0
32	8
33	7
34	1
35	7
36	3
37	0
38	5
39	7
40	4
41	0
42	3
43	0
44	3
45	7
46	8
47	0
48	2
49	2
50	2
51	6
52	3
53	0
54	10
55	2
56	3
57	1
58	3
59	0
60	3
61	0
62	2
63	2
64	18
65	2
66	11
67	0
68	2
69	6
70	9
71	0
72	10
73	0
74	1
75	1
76	2
77	5
78	1
79	0
80	16
81	2
82	8
83	0
84	3
85	11
86	6
87	10
88	2
89	0
90	4
91	1
92	15
93	2
94	1
95	9
96	2
97	0
98	7
99	7
100	1