A344208 - cp's OEIS frontend

A344208 Numbers k such that iterating x -> digsum(x)^2 + 1 from k one or more times results in a number < 10.

n	a(n)
1	1
2	2
3	3
4	6
5	9
6	10
7	11
8	12
9	15
10	18
11	19
12	20
13	21
14	24
15	27
16	28
17	30
18	33
19	36
20	37
21	39
22	42
23	45
24	46
25	48
26	51
27	54
28	55
29	57
30	60
31	63
32	64
33	66
34	69
35	72
36	73
37	75
38	78
39	81
40	82
41	84
42	87
43	90
44	91
45	93
46	96
47	99
48	100
49	101
50	102
51	105
52	108
53	109
54	110
55	111
56	114
57	117
58	118
59	120
60	123
61	126
62	127

[1, 2, 3, 6, 9, 10, 11, 12, 15, 18, 19, 20, 21, 24, 27, 28, 30, 33, 36, 37, 39, 42, 45, 46, 48, 51, 54, 55, 57, 60, 63, 64, 66, 69, 72, 73, 75, 78, 81, 82, 84, 87, 90, 91, 93, 96, 99, 100, 101, 102, 105, 108, 109, 110, 111, 114, 117, 118, 120, 123, 126, 127]

cp's OEIS Frontend

A344208 Numbers k such that iterating x -> digsum(x)^2 + 1 from k one or more times results in a number < 10.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	6
5	9
6	10
7	11
8	12
9	15
10	18
11	19
12	20
13	21
14	24
15	27
16	28
17	30
18	33
19	36
20	37
21	39
22	42
23	45
24	46
25	48
26	51
27	54
28	55
29	57
30	60
31	63
32	64
33	66
34	69
35	72
36	73
37	75
38	78
39	81
40	82
41	84
42	87
43	90
44	91
45	93
46	96
47	99
48	100
49	101
50	102
51	105
52	108
53	109
54	110
55	111
56	114
57	117
58	118
59	120
60	123
61	126
62	127

n	a(n)
1	1
2	2
3	3
4	6
5	9
6	10
7	11
8	12
9	15
10	18
11	19
12	20
13	21
14	24
15	27
16	28
17	30
18	33
19	36
20	37
21	39
22	42
23	45
24	46
25	48
26	51
27	54
28	55
29	57
30	60
31	63
32	64
33	66
34	69
35	72
36	73
37	75
38	78
39	81
40	82
41	84
42	87
43	90
44	91
45	93
46	96
47	99
48	100
49	101
50	102
51	105
52	108
53	109
54	110
55	111
56	114
57	117
58	118
59	120
60	123
61	126
62	127

n	a(n)
1	1
2	2
3	3
4	6
5	9
6	10
7	11
8	12
9	15
10	18
11	19
12	20
13	21
14	24
15	27
16	28
17	30
18	33
19	36
20	37
21	39
22	42
23	45
24	46
25	48
26	51
27	54
28	55
29	57
30	60
31	63
32	64
33	66
34	69
35	72
36	73
37	75
38	78
39	81
40	82
41	84
42	87
43	90
44	91
45	93
46	96
47	99
48	100
49	101
50	102
51	105
52	108
53	109
54	110
55	111
56	114
57	117
58	118
59	120
60	123
61	126
62	127