

A083190


a(1) = 1; for n>1 a(n) is smallest prime not occurring earlier such that the concatenation of a(n), a(n+1), ..., a(2n1) is a composite number.


1



1, 2, 5, 3, 7, 11, 13, 17, 23, 19, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277
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