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A084709
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a(1) = 4, for n > 1, a(n) = smallest multiple of a(n-1) such that a(n)-1 and a(n)+1 are twin primes.
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0
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4, 12, 60, 180, 1620, 9720, 417960, 7523280, 308454480, 25293267360, 1593475843680, 74893364652960, 4793175337789440, 517662936481259520, 21224180395731640320, 4075042635980474941440, 611256395397071241216000
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