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A118003 a(n) = largest integer <= n which is coprime to A118002(n-1). a(n) = A118002(n) - A118002(n-1). 2

%I

%S 1,2,2,4,5,5,7,7,8,10,11,11,13,13,14,16,17,17,19,19,20,22,23,23,25,25,

%T 26,28,29,29,31,31,32,34,35,35,37,37,38,40,41,41,43,43,44,46,47,47,49,

%U 49,50,52,53,53,55,55,56,58,59,59,61,61,62,64,65,65,67,67,68,70,71,71

%N a(n) = largest integer <= n which is coprime to A118002(n-1). a(n) = A118002(n) - A118002(n-1).

%p A118002 := proc(nmax) local a,n ; a := [0] ; while nops(a) < nmax do n := nops(a) ; while gcd(n,op(-1,a)) <> 1 do n := n-1 ; od ; a := [op(a), op(-1,a)+n] ; od ; RETURN(a) ; end: a118002 := A118002(100) : for n from 1 to nops(a118002)-1 do printf("%d, ",op(n+1,a118002)-op(n,a118002)) ; od ; # _R. J. Mathar_, Jun 06 2007

%Y Cf. A118001, A118002.

%K nonn

%O 1,2

%A _Leroy Quet_, Apr 09 2006

%E More terms from _R. J. Mathar_, Jun 06 2007

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Last modified September 18 05:51 EDT 2021. Contains 347509 sequences. (Running on oeis4.)