Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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**soroban****Member**- Registered: 2007-03-09
- Posts: 452

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**Tigeree****Member**- Registered: 2005-11-19
- Posts: 13,883

Seems you have yourself a nice beast there, soroban. Seems cheap for it's worth, too.

People don't notice whether it's winter or summer when they're happy.

~ Anton Chekhov

Cheer up, emo kid.

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**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 2,000

999 = An upside-down beat

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.

May his adventurous soul rest in peace at heaven.

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**Jai Ganesh****Administrator**- Registered: 2005-06-28
- Posts: 48,367

666 is the sum of the first 36 natural numbers

, i.e. 1 + 2 + 3 + ... + 34 + 35 + 36 = 666, and thus it is a triangular number. Notice that 36 = 15 + 21; 15, 21, and 36 are also triangular numbers; and 152 + 212 = 225 + 441 = 666.In base 10, 666 is a repdigit (and therefore a palindromic number) and a Smith number. A prime reciprocal magic square based on 1/149 in base 10 has a magic total of 666.

The prime factorization of 666 is

. Also, 666 is the sum of squares of first seven primes:The Roman numeral for 666, DCLXVI, has exactly one occurrence of all symbols whose value is less than 1000 in decreasing order (D = 500, C = 100, L = 50, X = 10, V = 5, I = 1).

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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