A084319 Orbit of 91 under function described in A084317.

91, 713, 2331, 3737, 37101, 383149, 1329473, 10912197, 328312853, 1129846623, 3735159117, 31245053039, 173977184859, 3293176308321, 319269241788861, 371325123869195203, 1278647733810375857, 1665622037676698019, 31742715741254857303, 56627509560552923867

Offset

0,1

Comments

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

References

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

Links

W. Edwin Clark, Table of n, a(n) for n = 0..63 [The trajectory to the first prime.]

Example

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

Mathematica

NestList[FromDigits@ Flatten@ IntegerDigits@ Map[First, FactorInteger@ #] &, 91, 17] (* Michael De Vlieger, Mar 25 2017 *)

Crossrefs

Cf. A084317, A056938, A084318, A343156.

Sequence in context: A020218 A217841 A338795 * A047696 A043459 A038488

Adjacent sequences: A084316 A084317 A084318 * A084320 A084321 A084322

Keyword

base,nonn

Author

Labos Elemer, Jun 16 2003

Extensions

Example corrected by Rémy Sigrist, Apr 07 2021

Status

approved