Sum Of Number Of Divisors Of Divisors Of A Number

Revision en1, by kalimm, 2015-11-08 13:20:38

What is the maximum number which is smaller than n, such that sum of number of divisors of divisors of this number is maximum?

For example,

g(n) = number of divisors of n

f(12) = g(1) + g(2) + g(3) + g(4) + g(6) + g(12)

f(12) = (1) + (2) + (2) + (3) + (4) + (6) = 18

Can you help about it?

Tags math, number theory

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  Rev. Lang. By When Δ Comment
en6 English kalimm 2015-11-22 13:05:42 3 Tiny change: '6)$ = $18$\n\nCan yo' -> '6)$ = $18$ \n\nCan yo'
en5 English kalimm 2015-11-12 13:13:42 9 Tiny change: ' example, \n\n$g(n)' -> ' example, \n\n$g(n)'
en4 English kalimm 2015-11-10 17:03:51 4 Tiny change: '$ $of$ $n$\n\n$f(12)' -> '$ $of$ $n$ \n\n$f(12)'
en3 English kalimm 2015-11-09 15:05:04 2 Tiny change: ') + g(12)$\n\n$f(12)' -> ') + g(12)$ \n\n$f(12)'
en2 English kalimm 2015-11-08 22:26:43 41
en1 English kalimm 2015-11-08 13:20:38 378 Initial revision (published)