A343538 - cp's OEIS frontend

A343538 Longest sequence of distinct two-digit numbers (10-99) such that any two or three consecutive terms can be concatenated into a prime number, even when connected into a loop. Smallest number is listed first.

n	a(n)
1	13
2	61
3	63
4	67
5	19
6	99
7	31
8	69
9	91
10	87
11	79
12	37
13	39
14	43
15	27
16	49
17	73
18	51

[13, 61, 63, 67, 19, 99, 31, 69, 91, 87, 79, 37, 39, 43, 27, 49, 73, 51]