

A031442


a(0) = 13; for n > 0, a(n) is the greatest prime factor of PreviousPrime(a(n1))*a(n1)1 where PreviousPrime(prime(k))=prime(k1).


4



13, 71, 41, 379, 23561, 5431, 20269, 89, 1231, 44497, 329952671, 36583, 1126159, 90209117, 14095897, 15272393, 13887359, 256460794943, 2740505805180429880723, 1591234463080874838018721796071210709
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