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A087128
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a(1)=1 and, for n>1, a(n) is the smallest positive integer such that 1+Sum[k, k=a(n-1)+1,...,a(n)] is prime.
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2
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1, 2, 5, 6, 13, 22, 25, 34, 37, 46, 58, 61, 73, 97, 106, 142, 145, 178, 181, 193, 202, 205, 217, 226, 238, 253, 277, 286, 298, 313, 346, 358, 382, 385, 394, 430, 433, 442, 466, 502, 529, 541, 553, 562, 565, 586, 682, 685, 694, 697, 709, 718, 721, 733, 838, 841
(list; graph; refs; listen; history; internal format)
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