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A simple logical question (Posted on 2007-07-27) Difficulty: 2 of 5
If d(x) denotes the no. positive divisors of x and d(d(d(x))), d(d(x)), d(x) and x can be arranged in 12 different ways. Find possible values of n(x), where n(x) is no. of prime factors of x. Also find possible values of x less than 100.

See The Solution Submitted by Praneeth    
Rating: 3.3333 (3 votes)

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re(2): computer exploration--lacking proof--spoilers Comment 4 of 4 |
(In reply to re: computer exploration--lacking proof--spoilers by Praneeth)

For an alternative see equation (2) in http://mathworld.wolfram.com/PrimeFactor.html

and Sloane's A001222

http://www.research.att.com/~njas/sequences/A001222

Edited on July 31, 2007, 11:04 am
  Posted by Charlie on 2007-07-31 10:35:25

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