

A321130


Values of m (mod 25) such that V(m) >= 2, where V(m) indicates the constant convergence speed of the tetration base m.


6




OFFSET

1,3


COMMENTS

This sequence represents the values of the base a such that a^^m, where ^^ indicates tetration or hyper4 (e.g., 3^^4=3^(3^(3^3))), is characterized by a convergence speed at or above 2 (fast madic convergence). Only 26% of the positive integers belong to this list (see A317905).


REFERENCES

Marco Ripà, La strana coda della serie n^n^...^n, Trento, UNI Service, Nov 2011. ISBN 9788861787896


LINKS



FORMULA

For m = 57, m (mod 25) == 7 and 7^^n has a convergence speed greater than 1, since A317905(m = 57) = 3 > 1 and also A317905(m = 7) = 2 > 1.


CROSSREFS



KEYWORD

nonn,fini,full


AUTHOR



STATUS

approved



