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A084319 Orbit of 91 under function described in A084317. 8

%I #14 Apr 08 2021 03:20:35

%S 91,713,2331,3737,37101,383149,1329473,10912197,328312853,1129846623,

%T 3735159117,31245053039,173977184859,3293176308321,319269241788861,

%U 371325123869195203,1278647733810375857,1665622037676698019,31742715741254857303,56627509560552923867

%N Orbit of 91 under function described in A084317.

%C This sequence takes 64 steps to reach a prime (which implies A343156(91)=64). - _N. J. A. Sloane_, Apr 07 2021

%D Eric Angelini, W. Edwin Clark, Hans Havermann, Frank Stevenson, Allan C. Wechsler, and others, Postings to Math Fun mailing list, April 2021.

%H W. Edwin Clark, <a href="/A084319/b084319.txt">Table of n, a(n) for n = 0..63</a> [The trajectory to the first prime.]

%e a(29) = 19797186041838357425713338412621, the 29th iterate.

%t NestList[FromDigits@ Flatten@ IntegerDigits@ Map[First, FactorInteger@ #] &, 91, 17] (* _Michael De Vlieger_, Mar 25 2017 *)

%Y Cf. A084317, A056938, A084318, A343156.

%K base,nonn

%O 0,1

%A _Labos Elemer_, Jun 16 2003

%E Example corrected by _Rémy Sigrist_, Apr 07 2021

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)