**Prime numbers that cannot be formed by the concatenation of previous terms.**

*2, 3, 5, 7, 11, 13, 17, 19, 29, 31, 41, 43, 47, 59, 61, 67, 71, 79, 83, 89, 97, 101, 103*

*4 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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