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A085309 Initial values providing nontrivial cyclic attractor when function defined in A085307 is iterated. 4

%I

%S 213,323,639,713

%N Initial values providing nontrivial cyclic attractor when function defined in A085307 is iterated.

%F Algorithm: 1# factorize n; 2# arrange prime-factors by decreasing size; 3# concatenate prime factors and interpret the result as decimal number.Iterate 1#, 2#, 3#.

%e n=213 gives {213,713,3123,3473,15123,713},

%e n=323 gives {323,1917,713,3123,3473,15123,713}

%e n=639 gives {639,713,3123,3473,15123,713}

%Y Cf. A084317-A084319, A085308, A085309.

%K base,nonn

%O 1,1

%A _Labos Elemer_, Jun 27 2003

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Last modified January 17 04:46 EST 2022. Contains 350378 sequences. (Running on oeis4.)