A061806 - cp's OEIS frontend

A061806 Numbers n such that the iterative cycle: n -> sum of digits of n^2 has only three distinct elements.

n	a(n)
1	4
2	5
3	17
4	26
5	28
6	32
7	37
8	40
9	43
10	44
11	49
12	50
13	53
14	62
15	63
16	64
17	67
18	73
19	74
20	76
21	77
22	82
23	83
24	86
25	87
26	88
27	89
28	91
29	92
30	93
31	94
32	97
33	98
34	107
35	109
36	113
37	114
38	116
39	117
40	118
41	122
42	124
43	125
44	126
45	127
46	128
47	133
48	137
49	141
50	143
51	149
52	154
53	157
54	158
55	161
56	164
57	166
58	167
59	169
60	170

[4, 5, 17, 26, 28, 32, 37, 40, 43, 44, 49, 50, 53, 62, 63, 64, 67, 73, 74, 76, 77, 82, 83, 86, 87, 88, 89, 91, 92, 93, 94, 97, 98, 107, 109, 113, 114, 116, 117, 118, 122, 124, 125, 126, 127, 128, 133, 137, 141, 143, 149, 154, 157, 158, 161, 164, 166, 167, 169, 170]

cp's OEIS Frontend

A061806 Numbers n such that the iterative cycle: n -> sum of digits of n^2 has only three distinct elements.

Table of values

List of values

n	a(n)
1	4
2	5
3	17
4	26
5	28
6	32
7	37
8	40
9	43
10	44
11	49
12	50
13	53
14	62
15	63
16	64
17	67
18	73
19	74
20	76
21	77
22	82
23	83
24	86
25	87
26	88
27	89
28	91
29	92
30	93
31	94
32	97
33	98
34	107
35	109
36	113
37	114
38	116
39	117
40	118
41	122
42	124
43	125
44	126
45	127
46	128
47	133
48	137
49	141
50	143
51	149
52	154
53	157
54	158
55	161
56	164
57	166
58	167
59	169
60	170

n	a(n)
1	4
2	5
3	17
4	26
5	28
6	32
7	37
8	40
9	43
10	44
11	49
12	50
13	53
14	62
15	63
16	64
17	67
18	73
19	74
20	76
21	77
22	82
23	83
24	86
25	87
26	88
27	89
28	91
29	92
30	93
31	94
32	97
33	98
34	107
35	109
36	113
37	114
38	116
39	117
40	118
41	122
42	124
43	125
44	126
45	127
46	128
47	133
48	137
49	141
50	143
51	149
52	154
53	157
54	158
55	161
56	164
57	166
58	167
59	169
60	170

n	a(n)
1	4
2	5
3	17
4	26
5	28
6	32
7	37
8	40
9	43
10	44
11	49
12	50
13	53
14	62
15	63
16	64
17	67
18	73
19	74
20	76
21	77
22	82
23	83
24	86
25	87
26	88
27	89
28	91
29	92
30	93
31	94
32	97
33	98
34	107
35	109
36	113
37	114
38	116
39	117
40	118
41	122
42	124
43	125
44	126
45	127
46	128
47	133
48	137
49	141
50	143
51	149
52	154
53	157
54	158
55	161
56	164
57	166
58	167
59	169
60	170