A344214 - cp's OEIS frontend

A344214 Numbers k such that repeated iterations of f(m) = (digsum(f(m-1)))^2 + 1 starting from f(1) = k will eventually yield 5 before any other single-digit number.

n	a(n)
1	5
2	11
3	15
4	18
5	19
6	20
7	24
8	27
9	28
10	33
11	36
12	37
13	39
14	42
15	45
16	46
17	48
18	51
19	54
20	55
21	57
22	60
23	63
24	64
25	66
26	69
27	72
28	73
29	75
30	78
31	81
32	82
33	84
34	87
35	90
36	91
37	93
38	96
39	99
40	101
41	105
42	108
43	109
44	110
45	114
46	117
47	118
48	123
49	126
50	127
51	129
52	132
53	135
54	136
55	138
56	141
57	144
58	145
59	147
60	150
61	153
62	154

[5, 11, 15, 18, 19, 20, 24, 27, 28, 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, 101, 105, 108, 109, 110, 114, 117, 118, 123, 126, 127, 129, 132, 135, 136, 138, 141, 144, 145, 147, 150, 153, 154]

cp's OEIS Frontend

A344214 Numbers k such that repeated iterations of f(m) = (digsum(f(m-1)))^2 + 1 starting from f(1) = k will eventually yield 5 before any other single-digit number.

Table of values

List of values

n	a(n)
1	5
2	11
3	15
4	18
5	19
6	20
7	24
8	27
9	28
10	33
11	36
12	37
13	39
14	42
15	45
16	46
17	48
18	51
19	54
20	55
21	57
22	60
23	63
24	64
25	66
26	69
27	72
28	73
29	75
30	78
31	81
32	82
33	84
34	87
35	90
36	91
37	93
38	96
39	99
40	101
41	105
42	108
43	109
44	110
45	114
46	117
47	118
48	123
49	126
50	127
51	129
52	132
53	135
54	136
55	138
56	141
57	144
58	145
59	147
60	150
61	153
62	154

n	a(n)
1	5
2	11
3	15
4	18
5	19
6	20
7	24
8	27
9	28
10	33
11	36
12	37
13	39
14	42
15	45
16	46
17	48
18	51
19	54
20	55
21	57
22	60
23	63
24	64
25	66
26	69
27	72
28	73
29	75
30	78
31	81
32	82
33	84
34	87
35	90
36	91
37	93
38	96
39	99
40	101
41	105
42	108
43	109
44	110
45	114
46	117
47	118
48	123
49	126
50	127
51	129
52	132
53	135
54	136
55	138
56	141
57	144
58	145
59	147
60	150
61	153
62	154

n	a(n)
1	5
2	11
3	15
4	18
5	19
6	20
7	24
8	27
9	28
10	33
11	36
12	37
13	39
14	42
15	45
16	46
17	48
18	51
19	54
20	55
21	57
22	60
23	63
24	64
25	66
26	69
27	72
28	73
29	75
30	78
31	81
32	82
33	84
34	87
35	90
36	91
37	93
38	96
39	99
40	101
41	105
42	108
43	109
44	110
45	114
46	117
47	118
48	123
49	126
50	127
51	129
52	132
53	135
54	136
55	138
56	141
57	144
58	145
59	147
60	150
61	153
62	154