A333716 - cp's OEIS frontend

A333716 a(0)=1; for n>0, a(n) is the greatest common divisor (GCD) of n and the sum of the previous terms back to the last GCD term, if the GCD is not already in the sequence; otherwise a(n) = a(n-1) + n.

n	a(n)
0	1
1	2
2	4
3	7
4	11
5	5
6	11
7	18
8	26
9	3
10	13
11	24
12	36
13	49
14	63
15	78
16	94
17	111
18	129
19	148
20	168
21	189
22	211
23	234
24	258
25	283
26	309
27	336
28	364
29	393
30	423
31	454
32	486
33	519
34	553
35	588
36	624
37	661
38	699
39	738
40	778
41	819
42	861
43	43
44	87
45	132
46	178
47	225
48	273
49	322
50	10
51	61
52	113
53	166
54	220
55	275
56	331
57	388
58	446
59	505
60	565

[1, 2, 4, 7, 11, 5, 11, 18, 26, 3, 13, 24, 36, 49, 63, 78, 94, 111, 129, 148, 168, 189, 211, 234, 258, 283, 309, 336, 364, 393, 423, 454, 486, 519, 553, 588, 624, 661, 699, 738, 778, 819, 861, 43, 87, 132, 178, 225, 273, 322, 10, 61, 113, 166, 220, 275, 331, 388, 446, 505, 565]

cp's OEIS Frontend

A333716 a(0)=1; for n>0, a(n) is the greatest common divisor (GCD) of n and the sum of the previous terms back to the last GCD term, if the GCD is not already in the sequence; otherwise a(n) = a(n-1) + n.

Table of values

List of values

n	a(n)
0	1
1	2
2	4
3	7
4	11
5	5
6	11
7	18
8	26
9	3
10	13
11	24
12	36
13	49
14	63
15	78
16	94
17	111
18	129
19	148
20	168
21	189
22	211
23	234
24	258
25	283
26	309
27	336
28	364
29	393
30	423
31	454
32	486
33	519
34	553
35	588
36	624
37	661
38	699
39	738
40	778
41	819
42	861
43	43
44	87
45	132
46	178
47	225
48	273
49	322
50	10
51	61
52	113
53	166
54	220
55	275
56	331
57	388
58	446
59	505
60	565

n	a(n)
0	1
1	2
2	4
3	7
4	11
5	5
6	11
7	18
8	26
9	3
10	13
11	24
12	36
13	49
14	63
15	78
16	94
17	111
18	129
19	148
20	168
21	189
22	211
23	234
24	258
25	283
26	309
27	336
28	364
29	393
30	423
31	454
32	486
33	519
34	553
35	588
36	624
37	661
38	699
39	738
40	778
41	819
42	861
43	43
44	87
45	132
46	178
47	225
48	273
49	322
50	10
51	61
52	113
53	166
54	220
55	275
56	331
57	388
58	446
59	505
60	565

n	a(n)
0	1
1	2
2	4
3	7
4	11
5	5
6	11
7	18
8	26
9	3
10	13
11	24
12	36
13	49
14	63
15	78
16	94
17	111
18	129
19	148
20	168
21	189
22	211
23	234
24	258
25	283
26	309
27	336
28	364
29	393
30	423
31	454
32	486
33	519
34	553
35	588
36	624
37	661
38	699
39	738
40	778
41	819
42	861
43	43
44	87
45	132
46	178
47	225
48	273
49	322
50	10
51	61
52	113
53	166
54	220
55	275
56	331
57	388
58	446
59	505
60	565