A007770 - cp's OEIS frontend

A007770 Happy numbers: numbers whose trajectory under iteration of sum of squares of digits map (see A003132) includes 1.

n	a(n)
1	1
2	7
3	10
4	13
5	19
6	23
7	28
8	31
9	32
10	44
11	49
12	68
13	70
14	79
15	82
16	86
17	91
18	94
19	97
20	100
21	103
22	109
23	129
24	130
25	133
26	139
27	167
28	176
29	188
30	190
31	192
32	193
33	203
34	208
35	219
36	226
37	230
38	236
39	239
40	262
41	263
42	280
43	291
44	293
45	301
46	302
47	310
48	313
49	319
50	320
51	326
52	329
53	331
54	338

[1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, 100, 103, 109, 129, 130, 133, 139, 167, 176, 188, 190, 192, 193, 203, 208, 219, 226, 230, 236, 239, 262, 263, 280, 291, 293, 301, 302, 310, 313, 319, 320, 326, 329, 331, 338]

cp's OEIS Frontend

A007770 Happy numbers: numbers whose trajectory under iteration of sum of squares of digits map (see A003132) includes 1.

Table of values

List of values

n	a(n)
1	1
2	7
3	10
4	13
5	19
6	23
7	28
8	31
9	32
10	44
11	49
12	68
13	70
14	79
15	82
16	86
17	91
18	94
19	97
20	100
21	103
22	109
23	129
24	130
25	133
26	139
27	167
28	176
29	188
30	190
31	192
32	193
33	203
34	208
35	219
36	226
37	230
38	236
39	239
40	262
41	263
42	280
43	291
44	293
45	301
46	302
47	310
48	313
49	319
50	320
51	326
52	329
53	331
54	338

n	a(n)
1	1
2	7
3	10
4	13
5	19
6	23
7	28
8	31
9	32
10	44
11	49
12	68
13	70
14	79
15	82
16	86
17	91
18	94
19	97
20	100
21	103
22	109
23	129
24	130
25	133
26	139
27	167
28	176
29	188
30	190
31	192
32	193
33	203
34	208
35	219
36	226
37	230
38	236
39	239
40	262
41	263
42	280
43	291
44	293
45	301
46	302
47	310
48	313
49	319
50	320
51	326
52	329
53	331
54	338

n	a(n)
1	1
2	7
3	10
4	13
5	19
6	23
7	28
8	31
9	32
10	44
11	49
12	68
13	70
14	79
15	82
16	86
17	91
18	94
19	97
20	100
21	103
22	109
23	129
24	130
25	133
26	139
27	167
28	176
29	188
30	190
31	192
32	193
33	203
34	208
35	219
36	226
37	230
38	236
39	239
40	262
41	263
42	280
43	291
44	293
45	301
46	302
47	310
48	313
49	319
50	320
51	326
52	329
53	331
54	338