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> Just Math> Science> Algorithms
Difficulty: 2 of 5 Latest: Neighbors (in Numbers)
Find the smallest integer n such that both n-1 and n+1 have the same number of divisors as n.
Bonus task: List few additional numbers with said feature.
(No Solution Yet, 0 Comments) Submitted on 2014-04-18 by Ady TZIDON   
Difficulty: 1 of 5 Bonus: 'Twas whispered in heaven (in Famous Riddles) Rating: 4.31
'Twas in heaven pronounced, and 'twas muttered in hell,
An echo caught faintly the sound as it fell;
On the confines of earth 'twas permitted to rest,
And the depths of the ocean its presence confessed;
'Twill be found in the sphere when 'tis riven asunder,
Be seen in the lightning and heard in the thunder.
'Twas allotted to man with his earliest breath,
Attends him at birth, and awaits him in death,
Presides o'er his happiness, honor, and health,
Is the prop of his house, and the end of his wealth.
In the heaps of the miser 'tis hoarded with care,
But is sure to be lost on the prodigal heir.
It begins every hope, every wish it must bound,
With the husbandman toils, and with monarchs is crowned.
Without it the soldier, the seaman may roam,
But woe to the wretch who expels it from home!
In the whispers of conscience its voice will be found,
Nor e'en in the whirlwind of passion be drowned.
'Twill not soften the heart; but though deaf be the ear,
It will make it acutely and instantly hear.
Yet in shade let it rest, like a delicate flower,
Ah... breathe on it softly, - it dies in an hour.

("A Riddle", by Joanna Baillie, 1762-1851)

(Solution Posted, 14 Comments) Submitted on 2005-06-17 by The riddler   
Difficulty: 4 of 5No way to win (in General)
Posted on 2014-04-17 by Ady TZIDON (No Solution Yet, 0 Comments)
Difficulty: 2 of 5Murderer Detection (in Riddles) Rating: 3.00
Posted on 2014-04-17 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Cubic Sequence? (in Sequences)
Posted on 2014-04-16 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Colorful hats (in Logic) Rating: 2.00
Posted on 2014-04-16 by Math Man (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Mod 3 alphametics (in Just Math)
Posted on 2014-04-15 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 2 of 5My phone is 2543663 (in Probability) Rating: 4.00
Posted on 2014-04-15 by Ady TZIDON (No Solution Yet, 5 Comments)
Difficulty: 4 of 5Pseudo-FIBO (in Sequences)
Posted on 2014-04-14 by Ady TZIDON (No Solution Yet, 5 Comments)
Difficulty: 3 of 5Question Quandary (in Logic)
Posted on 2014-04-14 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 4 of 5The right subset (in Word Problems)
Posted on 2014-04-13 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Geometric Sequence Settlement II (in Just Math) Rating: 3.00
Posted on 2014-04-12 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Upside down (OEIS A045573) (in Numbers)
Posted on 2014-04-11 by Ady TZIDON (No Solution Yet, 6 Comments)
Difficulty: 3 of 5Synonym Set (in Word Problems)
Posted on 2014-04-11 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Four Cards (in Logic)
Posted on 2014-04-10 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Integer Divisibility Dilemma (in Just Math) Rating: 4.00
Posted on 2014-04-10 by K Sengupta (No Solution Yet, 6 Comments)

Recently Posted Solutions:
Difficulty: 3 of 5Q: What is this sum? (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2014-04-09 00:05:29
Difficulty: 4 of 5It is not that easy (in General)
Submitted By Ady TZIDON. Solution posted on 2014-04-08 23:53:41
Difficulty: 3 of 5Logical connectives (in Algorithms)
Submitted By Math Man. Solution posted on 2014-04-03 18:51:23
Difficulty: 3 of 52 to 1 Bisector (in Geometry)
Submitted By Bractals. Solution posted on 2014-04-03 16:39:37
Difficulty: 3 of 5Liars Logic (in Liars and Knights)
Submitted By tomarken. Solution posted on 2014-03-24 13:44:53
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