[seqfan] Re: Mystery tour with a(n)=sigma(a(n-1))

Richard Mathar mathar at strw.leidenuniv.nl
Wed Feb 17 19:02:07 CET 2010

Under the map of n -> sigma(n)-n = A001065(n) the primes all flush into 1,
so there are two graphs, one with the 1, too crowded in some sense,
and one without

Richard Mathar

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