A341993 - cp's OEIS frontend

A341993 a(0)=0. For n > 0, a(n+1) = 2a(n) if the sum of digits of 2a(n) exceeds that of a(n); otherwise, a(n+1) is the smallest unused nonnegative integer.

n	a(n)
0	0
1	1
2	2
3	4
4	8
5	3
6	6
7	5
8	7
9	9
10	10
11	20
12	40
13	80
14	11
15	22
16	44
17	88
18	12
19	24
20	48
21	96
22	13
23	26
24	14
25	28
26	56
27	15
28	16
29	17
30	18
31	19
32	38
33	76
34	21
35	42
36	84
37	168
38	23
39	46
40	92
41	184
42	368
43	25
44	27
45	29
46	58
47	30
48	60
49	31
50	62
51	32
52	64
53	128
54	256
55	33
56	66
57	34
58	68
59	35
60	36
61	37
62	74
63	148
64	296
65	39

[0, 1, 2, 4, 8, 3, 6, 5, 7, 9, 10, 20, 40, 80, 11, 22, 44, 88, 12, 24, 48, 96, 13, 26, 14, 28, 56, 15, 16, 17, 18, 19, 38, 76, 21, 42, 84, 168, 23, 46, 92, 184, 368, 25, 27, 29, 58, 30, 60, 31, 62, 32, 64, 128, 256, 33, 66, 34, 68, 35, 36, 37, 74, 148, 296, 39]

cp's OEIS Frontend

A341993 a(0)=0. For n > 0, a(n+1) = 2a(n) if the sum of digits of 2a(n) exceeds that of a(n); otherwise, a(n+1) is the smallest unused nonnegative integer.

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	4
4	8
5	3
6	6
7	5
8	7
9	9
10	10
11	20
12	40
13	80
14	11
15	22
16	44
17	88
18	12
19	24
20	48
21	96
22	13
23	26
24	14
25	28
26	56
27	15
28	16
29	17
30	18
31	19
32	38
33	76
34	21
35	42
36	84
37	168
38	23
39	46
40	92
41	184
42	368
43	25
44	27
45	29
46	58
47	30
48	60
49	31
50	62
51	32
52	64
53	128
54	256
55	33
56	66
57	34
58	68
59	35
60	36
61	37
62	74
63	148
64	296
65	39

n	a(n)
0	0
1	1
2	2
3	4
4	8
5	3
6	6
7	5
8	7
9	9
10	10
11	20
12	40
13	80
14	11
15	22
16	44
17	88
18	12
19	24
20	48
21	96
22	13
23	26
24	14
25	28
26	56
27	15
28	16
29	17
30	18
31	19
32	38
33	76
34	21
35	42
36	84
37	168
38	23
39	46
40	92
41	184
42	368
43	25
44	27
45	29
46	58
47	30
48	60
49	31
50	62
51	32
52	64
53	128
54	256
55	33
56	66
57	34
58	68
59	35
60	36
61	37
62	74
63	148
64	296
65	39

cp's OEIS Frontend

A341993 a(0)=0. For n > 0, a(n+1) = 2*a(n) if the sum of digits of 2*a(n) exceeds that of a(n); otherwise, a(n+1) is the smallest unused nonnegative integer.

Table of values

List of values

A341993 a(0)=0. For n > 0, a(n+1) = 2a(n) if the sum of digits of 2a(n) exceeds that of a(n); otherwise, a(n+1) is the smallest unused nonnegative integer.

n	a(n)
0	0
1	1
2	2
3	4
4	8
5	3
6	6
7	5
8	7
9	9
10	10
11	20
12	40
13	80
14	11
15	22
16	44
17	88
18	12
19	24
20	48
21	96
22	13
23	26
24	14
25	28
26	56
27	15
28	16
29	17
30	18
31	19
32	38
33	76
34	21
35	42
36	84
37	168
38	23
39	46
40	92
41	184
42	368
43	25
44	27
45	29
46	58
47	30
48	60
49	31
50	62
51	32
52	64
53	128
54	256
55	33
56	66
57	34
58	68
59	35
60	36
61	37
62	74
63	148
64	296
65	39