comment(0) Update from Mathamatics!

Posted by Dazz - June 8, 2011 9:29 AM

130 is a sphenic number. It is a noncototient since there is no answer to the equation x - φ(x) = 130.

130 is the only integer that is the sum of the squares of its first four divisors, including 1: 12 + 22 + 52 + 102 = 130.

130 is the largest number that cannot be written as the sum of four hexagonal numbers.

How wonderful!

Enjoy these fantastic submissions - and as I said last week, and before that, still sooooo much to catch up on... Maybe in a few months there will be literally nothing to upload after an update...

Contributors: 15

B. Comet, Belial, Cyrus Annihilator, Davy Jones, Deathbringer, Elektro-OMEGA, iMansoorferoz, Lord Melchior, Maxim, Mr. C, Perseus, redblueyellow, Shard of Truth, Techokami, Yawackhary

Assets in this update: 129arrow_right

arrow_right [1] Amiga / Amiga CD32

arrow_right [3] DS / DSi

arrow_right [1] Game Boy / GBC

arrow_right [36] Game Boy Advance

arrow_right [25] Game Gear

arrow_right [3] Master System

arrow_right [6] PlayStation

arrow_right [44] Sega Genesis

arrow_right [10] SNES

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