A378513 - cp's OEIS frontend

A378513 a(1) = 1, a(n) = a(n-1) + n if all the digits of a(n-1) do not share a divisor greater than 1. Otherwise, a(n) = a(n-1) divided by the gcd of all its individual digits.

n	a(n)
1	1
2	3
3	1
4	5
5	1
6	7
7	1
8	9
9	1
10	11
11	22
12	11
13	24
14	12
15	27
16	43
17	60
18	10
19	29
20	49
21	70
22	10
23	33
24	11
25	36
26	12
27	39
28	13
29	42
30	21
31	52
32	84
33	21
34	55
35	11
36	47
37	84
38	21
39	60
40	10
41	51
42	93
43	31
44	75
45	120
46	166
47	213
48	261
49	310
50	360
51	120
52	172
53	225
54	279
55	334
56	390
57	130
58	188
59	247
60	307
61	368
62	430

[1, 3, 1, 5, 1, 7, 1, 9, 1, 11, 22, 11, 24, 12, 27, 43, 60, 10, 29, 49, 70, 10, 33, 11, 36, 12, 39, 13, 42, 21, 52, 84, 21, 55, 11, 47, 84, 21, 60, 10, 51, 93, 31, 75, 120, 166, 213, 261, 310, 360, 120, 172, 225, 279, 334, 390, 130, 188, 247, 307, 368, 430]

cp's OEIS Frontend

A378513 a(1) = 1, a(n) = a(n-1) + n if all the digits of a(n-1) do not share a divisor greater than 1. Otherwise, a(n) = a(n-1) divided by the gcd of all its individual digits.

Table of values

List of values

n	a(n)
1	1
2	3
3	1
4	5
5	1
6	7
7	1
8	9
9	1
10	11
11	22
12	11
13	24
14	12
15	27
16	43
17	60
18	10
19	29
20	49
21	70
22	10
23	33
24	11
25	36
26	12
27	39
28	13
29	42
30	21
31	52
32	84
33	21
34	55
35	11
36	47
37	84
38	21
39	60
40	10
41	51
42	93
43	31
44	75
45	120
46	166
47	213
48	261
49	310
50	360
51	120
52	172
53	225
54	279
55	334
56	390
57	130
58	188
59	247
60	307
61	368
62	430

n	a(n)
1	1
2	3
3	1
4	5
5	1
6	7
7	1
8	9
9	1
10	11
11	22
12	11
13	24
14	12
15	27
16	43
17	60
18	10
19	29
20	49
21	70
22	10
23	33
24	11
25	36
26	12
27	39
28	13
29	42
30	21
31	52
32	84
33	21
34	55
35	11
36	47
37	84
38	21
39	60
40	10
41	51
42	93
43	31
44	75
45	120
46	166
47	213
48	261
49	310
50	360
51	120
52	172
53	225
54	279
55	334
56	390
57	130
58	188
59	247
60	307
61	368
62	430

n	a(n)
1	1
2	3
3	1
4	5
5	1
6	7
7	1
8	9
9	1
10	11
11	22
12	11
13	24
14	12
15	27
16	43
17	60
18	10
19	29
20	49
21	70
22	10
23	33
24	11
25	36
26	12
27	39
28	13
29	42
30	21
31	52
32	84
33	21
34	55
35	11
36	47
37	84
38	21
39	60
40	10
41	51
42	93
43	31
44	75
45	120
46	166
47	213
48	261
49	310
50	360
51	120
52	172
53	225
54	279
55	334
56	390
57	130
58	188
59	247
60	307
61	368
62	430