A363572 - cp's OEIS frontend

A363572 Lexicographically earliest sequence of distinct terms > 0 such that the concatenation of the rightmost digit of a(n) and the leftmost digit of a(n+1) forms a prime number. The rightmost digit of a(n) cannot be 0.

n	a(n)
1	1
2	3
3	7
4	9
5	71
6	11
7	12
8	31
9	13
10	14
11	15
12	32
13	33
14	16
15	17
16	18
17	34
18	19
19	72
20	35
21	36
22	73
23	74
24	37
25	38
26	39
27	75
28	91
29	76
30	77
31	92
32	93
33	78
34	94
35	79
36	701
37	95
38	96
39	101
40	97
41	98
42	99
43	702
44	301
45	102
46	302
47	303
48	103
49	104
50	105
51	304
52	106
53	107
54	108
55	305
56	306
57	109
58	703
59	111
60	112
61	307
62	113
63	114
64	115

[1, 3, 7, 9, 71, 11, 12, 31, 13, 14, 15, 32, 33, 16, 17, 18, 34, 19, 72, 35, 36, 73, 74, 37, 38, 39, 75, 91, 76, 77, 92, 93, 78, 94, 79, 701, 95, 96, 101, 97, 98, 99, 702, 301, 102, 302, 303, 103, 104, 105, 304, 106, 107, 108, 305, 306, 109, 703, 111, 112, 307, 113, 114, 115]

cp's OEIS Frontend

A363572 Lexicographically earliest sequence of distinct terms > 0 such that the concatenation of the rightmost digit of a(n) and the leftmost digit of a(n+1) forms a prime number. The rightmost digit of a(n) cannot be 0.

Table of values

List of values

n	a(n)
1	1
2	3
3	7
4	9
5	71
6	11
7	12
8	31
9	13
10	14
11	15
12	32
13	33
14	16
15	17
16	18
17	34
18	19
19	72
20	35
21	36
22	73
23	74
24	37
25	38
26	39
27	75
28	91
29	76
30	77
31	92
32	93
33	78
34	94
35	79
36	701
37	95
38	96
39	101
40	97
41	98
42	99
43	702
44	301
45	102
46	302
47	303
48	103
49	104
50	105
51	304
52	106
53	107
54	108
55	305
56	306
57	109
58	703
59	111
60	112
61	307
62	113
63	114
64	115

n	a(n)
1	1
2	3
3	7
4	9
5	71
6	11
7	12
8	31
9	13
10	14
11	15
12	32
13	33
14	16
15	17
16	18
17	34
18	19
19	72
20	35
21	36
22	73
23	74
24	37
25	38
26	39
27	75
28	91
29	76
30	77
31	92
32	93
33	78
34	94
35	79
36	701
37	95
38	96
39	101
40	97
41	98
42	99
43	702
44	301
45	102
46	302
47	303
48	103
49	104
50	105
51	304
52	106
53	107
54	108
55	305
56	306
57	109
58	703
59	111
60	112
61	307
62	113
63	114
64	115

n	a(n)
1	1
2	3
3	7
4	9
5	71
6	11
7	12
8	31
9	13
10	14
11	15
12	32
13	33
14	16
15	17
16	18
17	34
18	19
19	72
20	35
21	36
22	73
23	74
24	37
25	38
26	39
27	75
28	91
29	76
30	77
31	92
32	93
33	78
34	94
35	79
36	701
37	95
38	96
39	101
40	97
41	98
42	99
43	702
44	301
45	102
46	302
47	303
48	103
49	104
50	105
51	304
52	106
53	107
54	108
55	305
56	306
57	109
58	703
59	111
60	112
61	307
62	113
63	114
64	115