A253550 - cp's OEIS frontend

A253550 Shift one instance of the largest prime one step towards larger primes: a(1) = 1, for n>1: a(n) = (n / prime(g)) * prime(g+1), where g = A061395(n), index of the greatest prime dividing n.

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	10
7	11
8	12
9	15
10	14
11	13
12	20
13	17
14	22
15	21
16	24
17	19
18	30
19	23
20	28
21	33
22	26
23	29
24	40
25	35
26	34
27	45
28	44
29	31
30	42
31	37
32	48
33	39
34	38
35	55
36	60
37	41
38	46
39	51
40	56
41	43
42	66
43	47
44	52
45	63
46	58
47	53
48	80
49	77
50	70
51	57
52	68
53	59
54	90
55	65
56	88
57	69
58	62
59	61
60	84
61	67
62	74
63	99
64	96
65	85
66	78
67	71
68	76
69	87
70	110
71	73
72	120
73	79
74	82
75	105
76	92
77	91
78	102
79	83
80	112
81	135
82	86
83	89

[1, 3, 5, 6, 7, 10, 11, 12, 15, 14, 13, 20, 17, 22, 21, 24, 19, 30, 23, 28, 33, 26, 29, 40, 35, 34, 45, 44, 31, 42, 37, 48, 39, 38, 55, 60, 41, 46, 51, 56, 43, 66, 47, 52, 63, 58, 53, 80, 77, 70, 57, 68, 59, 90, 65, 88, 69, 62, 61, 84, 67, 74, 99, 96, 85, 78, 71, 76, 87, 110, 73, 120, 79, 82, 105, 92, 91, 102, 83, 112, 135, 86, 89]

cp's OEIS Frontend

A253550 Shift one instance of the largest prime one step towards larger primes: a(1) = 1, for n>1: a(n) = (n / prime(g)) * prime(g+1), where g = A061395(n), index of the greatest prime dividing n.

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	10
7	11
8	12
9	15
10	14
11	13
12	20
13	17
14	22
15	21
16	24
17	19
18	30
19	23
20	28
21	33
22	26
23	29
24	40
25	35
26	34
27	45
28	44
29	31
30	42
31	37
32	48
33	39
34	38
35	55
36	60
37	41
38	46
39	51
40	56
41	43
42	66
43	47
44	52
45	63
46	58
47	53
48	80
49	77
50	70
51	57
52	68
53	59
54	90
55	65
56	88
57	69
58	62
59	61
60	84
61	67
62	74
63	99
64	96
65	85
66	78
67	71
68	76
69	87
70	110
71	73
72	120
73	79
74	82
75	105
76	92
77	91
78	102
79	83
80	112
81	135
82	86
83	89

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	10
7	11
8	12
9	15
10	14
11	13
12	20
13	17
14	22
15	21
16	24
17	19
18	30
19	23
20	28
21	33
22	26
23	29
24	40
25	35
26	34
27	45
28	44
29	31
30	42
31	37
32	48
33	39
34	38
35	55
36	60
37	41
38	46
39	51
40	56
41	43
42	66
43	47
44	52
45	63
46	58
47	53
48	80
49	77
50	70
51	57
52	68
53	59
54	90
55	65
56	88
57	69
58	62
59	61
60	84
61	67
62	74
63	99
64	96
65	85
66	78
67	71
68	76
69	87
70	110
71	73
72	120
73	79
74	82
75	105
76	92
77	91
78	102
79	83
80	112
81	135
82	86
83	89

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	10
7	11
8	12
9	15
10	14
11	13
12	20
13	17
14	22
15	21
16	24
17	19
18	30
19	23
20	28
21	33
22	26
23	29
24	40
25	35
26	34
27	45
28	44
29	31
30	42
31	37
32	48
33	39
34	38
35	55
36	60
37	41
38	46
39	51
40	56
41	43
42	66
43	47
44	52
45	63
46	58
47	53
48	80
49	77
50	70
51	57
52	68
53	59
54	90
55	65
56	88
57	69
58	62
59	61
60	84
61	67
62	74
63	99
64	96
65	85
66	78
67	71
68	76
69	87
70	110
71	73
72	120
73	79
74	82
75	105
76	92
77	91
78	102
79	83
80	112
81	135
82	86
83	89