OFFSET
1,2
COMMENTS
WARNING: the listed terms are not proved to be in order. According to Basso (2017), it is not even proved that a(2) = 30154214043975990969. - Max Alekseyev, Mar 25 2023
LINKS
Andrea Basso, Power values of the sigma function, Bachelor’s Project Mathematics, University of Gronigen, July 2017. See Appendix D p. 36.
PROG
(PARI) isok(n) = ispower(sigma(n^3), 3); \\ Michel Marcus, Jul 19 2017
CROSSREFS
KEYWORD
nonn,more
AUTHOR
STATUS
approved