A137905 - cp's OEIS frontend

A137905 Numbers that appear as binomial coefficients exactly twice.

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

[3, 4, 5, 7, 8, 9, 11, 12, 13, 14, 16, 17, 18, 19, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 37, 38, 39, 40, 41, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 54, 57, 58, 59, 60, 61, 62, 63, 64, 65, 67, 68, 69, 71, 72, 73, 74, 75, 76, 77, 79, 80, 81, 82, 83, 85, 86, 87, 88]

cp's OEIS Frontend

A137905 Numbers that appear as binomial coefficients exactly twice.

Table of values

List of values

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

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

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