OFFSET
1,2
COMMENTS
It is also known that a(12) = 71400.
Then for higher indices n, we have:
a(11) <= 414230544000;
a(13) <= 2667897127526400;
a(14) <= 446464417259520;
a(15) <= 23613006957281280;
a(16) <= 22227004800;
a(17) <= 3134896756992000;
a(18) <= 15414516736819200;
a(20) <= 53129265653882880.
a(16) = 8420630400. - Giovanni Resta, Aug 25 2018
LINKS
Tomohiro Yamada, Infinitary superperfect numbers, Annales Mathematicae et Informaticae, 47 (2017) pp. 211-218. See Table 1.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Michel Marcus, Aug 23 2018
STATUS
approved