OFFSET
1,2
COMMENTS
All terms are deficient and after the 4th term sigma(n)/n appears to stay between 1.5 and 1.6.
Note that sequence is not monotonic and can return later to previous terms values.
LINKS
Michel Marcus, Table of n, a(n) for n = 1..1000
PROG
(PARI) lista(nn) = {forstep(n=1, nn, 2, v = vector(n, k, sigma(k)/k); w = vecsort(v, , 1); print1(w[(n+1)/2], ", "); ); }
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Marcus, Apr 02 2015
STATUS
approved