A138841 - cp's OEIS frontend

A138841 Concatenation of initial and final digit of n-th Mersenne prime A000668(n).

n	a(n)
1	33
2	77
3	31
4	17
5	81
6	11
7	57
8	27
9	21
10	61
11	17
12	17
13	61
14	57
15	17
16	17
17	41
18	21
19	11
20	27
21	41
22	31
23	21
24	41
25	41
26	41
27	81
28	57
29	57
30	51
31	77
32	17
33	11
34	47
35	81
36	61
37	11
38	41
39	91
40	17
41	27
42	17
43	31
44	11
45	27
46	11
47	31

[33, 77, 31, 17, 81, 11, 57, 27, 21, 61, 17, 17, 61, 57, 17, 17, 41, 21, 11, 27, 41, 31, 21, 41, 41, 41, 81, 57, 57, 51, 77, 17, 11, 47, 81, 61, 11, 41, 91, 17, 27, 17, 31, 11, 27, 11, 31]

cp's OEIS Frontend

A138841 Concatenation of initial and final digit of n-th Mersenne prime A000668(n).

Table of values

List of values

n	a(n)
1	33
2	77
3	31
4	17
5	81
6	11
7	57
8	27
9	21
10	61
11	17
12	17
13	61
14	57
15	17
16	17
17	41
18	21
19	11
20	27
21	41
22	31
23	21
24	41
25	41
26	41
27	81
28	57
29	57
30	51
31	77
32	17
33	11
34	47
35	81
36	61
37	11
38	41
39	91
40	17
41	27
42	17
43	31
44	11
45	27
46	11
47	31

n	a(n)
1	33
2	77
3	31
4	17
5	81
6	11
7	57
8	27
9	21
10	61
11	17
12	17
13	61
14	57
15	17
16	17
17	41
18	21
19	11
20	27
21	41
22	31
23	21
24	41
25	41
26	41
27	81
28	57
29	57
30	51
31	77
32	17
33	11
34	47
35	81
36	61
37	11
38	41
39	91
40	17
41	27
42	17
43	31
44	11
45	27
46	11
47	31

n	a(n)
1	33
2	77
3	31
4	17
5	81
6	11
7	57
8	27
9	21
10	61
11	17
12	17
13	61
14	57
15	17
16	17
17	41
18	21
19	11
20	27
21	41
22	31
23	21
24	41
25	41
26	41
27	81
28	57
29	57
30	51
31	77
32	17
33	11
34	47
35	81
36	61
37	11
38	41
39	91
40	17
41	27
42	17
43	31
44	11
45	27
46	11
47	31