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A084716
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a(1) = 1, a(n) = smallest multiple of a(n-1) > a(n-1) such that a(n) + 1 is a prime.
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3
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1, 2, 4, 12, 36, 72, 432, 1296, 2592, 10368, 72576, 508032, 1524096, 12192768, 73156608, 146313216, 438939648, 2633637888, 23702740992, 142216445952, 1991030243328, 37829574623232, 416125320855552
(list; graph; refs; listen; history; internal format)
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