OFFSET
1,1
COMMENTS
Corresponding values of tau(m): 4, 24, 24, 16, 16, 16, 16, 32, 32, 16, 32, 32, 32, ...
Corresponding values of sigma(m): 12, 127680, 268128, 274560, 483840, 483840, 855360, 1996800, 2862720, 2472960, ...
EXAMPLE
tau(6) = 4 = 2 * tau(5) = 2 * 2, sigma(6) = 12 = 2 * sigma(5) = 2 * 6.
PROG
(Magma) [m: m in [2..10^6] | #Divisors(m) eq 2 * #Divisors(m - 1) and &+Divisors(m) eq 2 * &+Divisors(m - 1)]
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Apr 18 2022
STATUS
approved