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Re: how to iterate

• To: mathgroup at smc.vnet.net
• Subject: [mg65976] Re: how to iterate
• From: "Richard" <rkausch at free.fr>
• Date: Tue, 25 Apr 2006 05:19:04 -0400 (EDT)
• References: <e2i987$9fc$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hello Valentino
You don't need to list the values of your sequence f(n) .It is
periodic:
f[1] = 1;
f[2] = 2;
f[3] = 3;
f[n_] := (f[n - 1] + f[n - 2] + 1)/f[n - 3].
This gives f(9)=1;f(10)=2; f(11)=3 and then the period is given by f(i)
for i=1,...8.
Was that the real problem?
Richard Kausch  Paris (F)