Add-and-reverse: A007396,A003608,A007397,A007398,A007399

Sat Feb 5 21:22:40 CET 2005

Dear seqfans,

In A007396, A003608, A007397, A007398, A007399,

the "add m and reverse!" rule is considered for m = 2, 4, 5, 7, 8,  respectively.

As usually, in such cases, SEQ may end with cycle, or not.

I checked all cases for m 1 to 30, and found that cycles occur

in all cases, except m = 10,20,30 

(actually I've checked some (1-3)10^5 terms, with no cycle).

Can anyone find the cycle or prove that no cycle exists in m = 10,20,30... cases.

Thanks,

Zak

Neil,

Are these 30 SEQs OK for OEIS?

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