F_qs Decomposition of the quasi_over_square in its prime factors.
Date Date of discovery by the author.
Hypertext links to related topics in number theory
Comm Comments about the palindromic Quasi_Over_Square number.
F_qs 30.103 =
Comm 30103 is the only known multi-digit palindromic prime
of the form sigma(n)/d(n), when n is composite. ( McCranie and Honaker )
sigma(n) = the sum of all the factors of n, including 1 and n itself.
d(n) = the number of factors of n, including 1 and n itself.
30103 is also nice because it comes up for
n = 149645 (an odd number) and once for
n = 179574 (an even number).
n sigma(n) d(n) sigma(n)/d(n)=palprime
149645 180618 6 30103
179574 361236 12 30103
30103 is still the only "known" palprime with the property.