OFFSET
1,5
COMMENTS
If A368458 is written as an irregular triangle for n >= 3, then a(n) is the length of row n.
Conjecture: For all n >= 5, there is at least one j such that b(j) = 2 * (Bacher(j) - sigma(j)) + j + 1 is > 0 and prime(n)^2 < b(j) < prime(n + 1)^2. In other words, a(n) > 1 for n >= 5.
EXAMPLE
a(11) = 5 because 31^2 = 961, 1073, 1147, 1271, 1333, 1369 = 37^2 and all the terms are in that order in A368458.
PROG
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Peter Luschny, Dec 26 2023
STATUS
approved