OFFSET
1,1
COMMENTS
This sequence is similar to A071927, but with ratio 3 rather than 2.
a(28) > 7*10^10. - Giovanni Resta, Jun 24 2015
PROG
(PARI) lista(nn) = {abk = 4; for (n = 1, nn, ab = sigma(n)/n; if ((ab > 3) && (ab < abk), print1(n, ", "); abk = ab); ); }
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Marcus, Jun 24 2015
EXTENSIONS
a(23)-a(27) from Giovanni Resta, Jun 24 2015
STATUS
approved