A280495 - OEIS

%I #7 Jan 10 2017 19:13:08

%S 1,1,1,2,1,3,1,4,3,5,1,6,1,7,5,8,1,9,1,10,9,11,1,12,5,13,7,14,1,15,1,

%T 16,13,17,7,18,1,19,21,20,1,27,1,22,11,23,1,24,7,25,25,26,1,21,13,28,

%U 33,29,1,30,1,31,19,32,19,39,1,34,37,35,1,36,1,37,17,38,11,63,1,40,15,41,1,54,31,43,45,44,1,33,17,46,57,47,37,48,1,49,27,50,1

%N a(n) = A032742(A250245(n)).

%H Antti Karttunen, <a href="/A280495/b280495.txt">Table of n, a(n) for n = 1..8192</a>

%F a(n) = A032742(A250245(n)).

%F a(n) = A250245(n) / A020639(n). [Because A250245 preserves the smallest prime factor of n.]

%o (Scheme) (define (A280495 n) (A032742 (A250245 n)))

%Y Cf. A020639, A032742, A250245.

%Y Differs from related A280496 and A280498 for the first time at n=33, where a(33) = 13, while A280496(33) = A280498(33) = 15.

%Y Differs from related A280497 for the first time at n=42, where a(42) = 27, while A280497(42) = 21.

%K nonn

%O 1,4

%A _Antti Karttunen_, Jan 09 2017