A117622 - cp's OEIS frontend

A117622 Minesweeper sequence: a(n) is the first nonprime number, k, not occurring previously in the sequence nor the absolute value of its first forward difference among the first differences and a(1)=1.

n	a(n)
1	1
2	4
3	6
4	10
5	9
6	14
7	8
8	15
9	24
10	12
11	20
12	30
13	16
14	27
15	40
16	18
17	33
18	49
19	21
20	38
21	56
22	22
23	42
24	63
25	25
26	44
27	68
28	26
29	51
30	28
31	54
32	81
33	32
34	62
35	91
36	34
37	65
38	98
39	35
40	70
41	102
42	36
43	72
44	111
45	39
46	76
47	116
48	45
49	86
50	129
51	46
52	90
53	135
54	48
55	94
56	141
57	50
58	100
59	52
60	104
61	155
62	55
63	108
64	162
65	57
66	112
67	168

[1, 4, 6, 10, 9, 14, 8, 15, 24, 12, 20, 30, 16, 27, 40, 18, 33, 49, 21, 38, 56, 22, 42, 63, 25, 44, 68, 26, 51, 28, 54, 81, 32, 62, 91, 34, 65, 98, 35, 70, 102, 36, 72, 111, 39, 76, 116, 45, 86, 129, 46, 90, 135, 48, 94, 141, 50, 100, 52, 104, 155, 55, 108, 162, 57, 112, 168]

cp's OEIS Frontend

A117622 Minesweeper sequence: a(n) is the first nonprime number, k, not occurring previously in the sequence nor the absolute value of its first forward difference among the first differences and a(1)=1.

Table of values

List of values

n	a(n)
1	1
2	4
3	6
4	10
5	9
6	14
7	8
8	15
9	24
10	12
11	20
12	30
13	16
14	27
15	40
16	18
17	33
18	49
19	21
20	38
21	56
22	22
23	42
24	63
25	25
26	44
27	68
28	26
29	51
30	28
31	54
32	81
33	32
34	62
35	91
36	34
37	65
38	98
39	35
40	70
41	102
42	36
43	72
44	111
45	39
46	76
47	116
48	45
49	86
50	129
51	46
52	90
53	135
54	48
55	94
56	141
57	50
58	100
59	52
60	104
61	155
62	55
63	108
64	162
65	57
66	112
67	168

n	a(n)
1	1
2	4
3	6
4	10
5	9
6	14
7	8
8	15
9	24
10	12
11	20
12	30
13	16
14	27
15	40
16	18
17	33
18	49
19	21
20	38
21	56
22	22
23	42
24	63
25	25
26	44
27	68
28	26
29	51
30	28
31	54
32	81
33	32
34	62
35	91
36	34
37	65
38	98
39	35
40	70
41	102
42	36
43	72
44	111
45	39
46	76
47	116
48	45
49	86
50	129
51	46
52	90
53	135
54	48
55	94
56	141
57	50
58	100
59	52
60	104
61	155
62	55
63	108
64	162
65	57
66	112
67	168

n	a(n)
1	1
2	4
3	6
4	10
5	9
6	14
7	8
8	15
9	24
10	12
11	20
12	30
13	16
14	27
15	40
16	18
17	33
18	49
19	21
20	38
21	56
22	22
23	42
24	63
25	25
26	44
27	68
28	26
29	51
30	28
31	54
32	81
33	32
34	62
35	91
36	34
37	65
38	98
39	35
40	70
41	102
42	36
43	72
44	111
45	39
46	76
47	116
48	45
49	86
50	129
51	46
52	90
53	135
54	48
55	94
56	141
57	50
58	100
59	52
60	104
61	155
62	55
63	108
64	162
65	57
66	112
67	168