cp's OEIS Frontend

A066262 a(n) = gcd(n, A066260(n)).

%I A066262 #26 Jan 30 2022 15:55:44
%S A066262 1,2,3,4,1,6,1,8,9,2,1,12,1,2,3,16,1,18,1,4,3,2,1,24,1,2,27,4,1,6,1,
%T A066262 32,3,2,1,36,1,2,3,8,1,6,1,4,9,2,1,48,1,2,3,4,1,54,5,8,3,2,1,12,1,2,9,
%U A066262 64,1,6,1,4,3,2,1,72,1,2,3,4,1,6,1,16,81,2,1,12,1,2,3,8,1,18,1,4,3,2,5,96
%N A066262 a(n) = gcd(n, A066260(n)).
%C A066262 Same as A065331 through a(54); A065331(55)=1, but a(55)=5. - _Jon E. Schoenfield_, Jan 28 2022
%H A066262 Harry J. Smith, <a href="/A066262/b066262.txt">Table of n, a(n) for n = 1..1000</a>
%o A066262 (PARI) Composite(n) = { my(k=n + primepi(n) + 1); while (k != n + primepi(k) + 1, k = n + primepi(k) + 1); return(k) }
%o A066262 { for (n=1, 100, my(f=factor(n), a=1); for (i=1, matsize(f)[1], a*=Composite(primepi(f[i, 1]))^f[i, 2]); a=gcd(n, a); print1(a, ", ") ) } \\ _Harry J. Smith_, Feb 07 2010
%Y A066262 Cf. A066260.
%Y A066262 Different from A065331.
%K A066262 nonn
%O A066262 1,2
%A A066262 _Reinhard Zumkeller_, Dec 10 2001