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Product of distinct primes dividing both b(n) and b(n+1), where b(n) = A336957(n).
4

%I #13 Dec 10 2023 17:34:40

%S 1,2,3,5,7,2,3,11,5,2,3,7,11,2,5,3,13,2,7,3,17,2,19,3,23,2,5,13,7,6,5,

%T 17,7,2,3,5,19,2,3,29,5,2,11,3,31,2,13,3,35,2,29,3,37,2,17,3,41,2,5,

%U 23,7,6,5,31,7,2,3,43,5,2,3,47,5,22,3,7,19,2,3,5,7,2,13,11,17,2,43,7

%N Product of distinct primes dividing both b(n) and b(n+1), where b(n) = A336957(n).

%C This is the radical (cf. A007947) of A337007. First differs from A337007 at n=34.

%H N. J. A. Sloane, <a href="/A337008/b337008.txt">Table of n, a(n) for n = 1..20000</a>

%Y Cf. A007947, A336957, A337007.

%K nonn

%O 1,2

%A _Scott R. Shannon_ and _N. J. A. Sloane_, Aug 11 2020