A356867 - cp's OEIS frontend

A356867 For n >= 1, write n = 3^m + k, where m >= 0 is the greatest power of 3 <= n, and k is in the range 0 <= k < 3^(m+1) - 3^m, then for n such that k=0, a(n)=n, and for n such that k > 0, a(n) is the smallest prime multiple p*a(k), p != 3, that is not already a term.

n	a(n)
1	1
2	2
3	3
4	5
5	4
6	6
7	10
8	8
9	9
10	7
11	14
12	15
13	25
14	20
15	12
16	50
17	16
18	18
19	35
20	28
21	30
22	125
23	40
24	24
25	100
26	32
27	27
28	11
29	22
30	21
31	55
32	44
33	42
34	70
35	56
36	45
37	49
38	98
39	75
40	175
41	140
42	60
43	250
44	80
45	36
46	245
47	196
48	150
49	625
50	200
51	48
52	500
53	64
54	54
55	77
56	110
57	105
58	275
59	88
60	84
61	350
62	112
63	90
64	343

[1, 2, 3, 5, 4, 6, 10, 8, 9, 7, 14, 15, 25, 20, 12, 50, 16, 18, 35, 28, 30, 125, 40, 24, 100, 32, 27, 11, 22, 21, 55, 44, 42, 70, 56, 45, 49, 98, 75, 175, 140, 60, 250, 80, 36, 245, 196, 150, 625, 200, 48, 500, 64, 54, 77, 110, 105, 275, 88, 84, 350, 112, 90, 343]

cp's OEIS Frontend

A356867 For n >= 1, write n = 3^m + k, where m >= 0 is the greatest power of 3 <= n, and k is in the range 0 <= k < 3^(m+1) - 3^m, then for n such that k=0, a(n)=n, and for n such that k > 0, a(n) is the smallest prime multiple p*a(k), p != 3, that is not already a term.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	5
5	4
6	6
7	10
8	8
9	9
10	7
11	14
12	15
13	25
14	20
15	12
16	50
17	16
18	18
19	35
20	28
21	30
22	125
23	40
24	24
25	100
26	32
27	27
28	11
29	22
30	21
31	55
32	44
33	42
34	70
35	56
36	45
37	49
38	98
39	75
40	175
41	140
42	60
43	250
44	80
45	36
46	245
47	196
48	150
49	625
50	200
51	48
52	500
53	64
54	54
55	77
56	110
57	105
58	275
59	88
60	84
61	350
62	112
63	90
64	343

n	a(n)
1	1
2	2
3	3
4	5
5	4
6	6
7	10
8	8
9	9
10	7
11	14
12	15
13	25
14	20
15	12
16	50
17	16
18	18
19	35
20	28
21	30
22	125
23	40
24	24
25	100
26	32
27	27
28	11
29	22
30	21
31	55
32	44
33	42
34	70
35	56
36	45
37	49
38	98
39	75
40	175
41	140
42	60
43	250
44	80
45	36
46	245
47	196
48	150
49	625
50	200
51	48
52	500
53	64
54	54
55	77
56	110
57	105
58	275
59	88
60	84
61	350
62	112
63	90
64	343

n	a(n)
1	1
2	2
3	3
4	5
5	4
6	6
7	10
8	8
9	9
10	7
11	14
12	15
13	25
14	20
15	12
16	50
17	16
18	18
19	35
20	28
21	30
22	125
23	40
24	24
25	100
26	32
27	27
28	11
29	22
30	21
31	55
32	44
33	42
34	70
35	56
36	45
37	49
38	98
39	75
40	175
41	140
42	60
43	250
44	80
45	36
46	245
47	196
48	150
49	625
50	200
51	48
52	500
53	64
54	54
55	77
56	110
57	105
58	275
59	88
60	84
61	350
62	112
63	90
64	343