A280498 - OEIS

%I #6 Jan 10 2017 19:13:32

%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 16,15,17,7,18,1,19,11,20,1,21,1,22,27,23,1,24,7,25,25,26,1,27,25,28,

%U 21,29,1,30,1,31,13,32,11,33,1,34,45,35,1,36,1,37,17,38,11,39,1,40,33,41,1,42,35,43,35,44,1,45,49,46,81,47,13,48,1,49,19,50,1

%N a(n) = A032742(A249818(n)).

%H Antti Karttunen, <a href="/A280498/b280498.txt">Table of n, a(n) for n = 1..8192</a>

%F a(n) = A032742(A249818(n)).

%F a(n) = A249818(n) / A020639(n). [Because A249818 preserves the smallest prime factor of n.]

%o (Scheme) (define (A280498 n) (A032742 (A249818 n)))

%Y Cf. A020639, A032742, A249818.

%Y Differs from related A280495 and A280497 for the first time at n=33, where a(33) = 15, while A280495(33) = A280497(33) = 13.

%Y Differs from related A280496 for the first time at n=42, where a(42) = 21, while A280496(42) = 27.

%K nonn

%O 1,4

%A _Antti Karttunen_, Jan 09 2017