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a(n) = gcd(b(n),b(n+1)), where b(n) = A336957(n).
4

%I #14 Sep 25 2020 12:13:33

%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 17,7,8,3,5,19,4,3,29,5,2,11,3,31,2,13,3,35,2,29,3,37,2,17,3,41,2,5,

%U 23,7,12,5,31,7,2,3,43,5,2,3,47,5,22,3,7,19,8,9,5,7,2,13,11

%N a(n) = gcd(b(n),b(n+1)), where b(n) = A336957(n).

%H N. J. A. Sloane, <a href="/A337007/b337007.txt">Table of n, a(n) for n = 1..20000</a>

%e A336957(3)=6, A336957(4) = 15, gcd(6,15) = 3 = a(3).

%Y Cf. A336957, A337008.

%K nonn

%O 1,2

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