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A090559
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Beginning with 2, least number such that concatenation of r copies of a(r), r = 1 to n is prime.
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1
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2, 1, 3, 1, 9, 3, 273, 219, 7, 281, 11, 119, 1019, 111, 47, 69, 171, 161, 103, 477, 817, 129, 271, 73, 1867, 381, 507, 113, 2643, 487, 3037, 727, 1109, 1789, 5829, 4937, 767
(list; graph; refs; listen; history; internal format)
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