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

You are not logged in. #1 20121229 00:07:17
GCD(sum_(i=1 to N) i!, sum_(i=1 to N+1) i!) = 99 for N >= 10Just curious if anyone else has observed this. I have found it true up to N = 1 million. Prime numbers have got to be the neatest things; they are like atoms. Composites are two or more primes held together by multiplication. In biology, we use math like we know what we are talking about. Sad isn't it. #2 20121231 23:32:49
Re: GCD(sum_(i=1 to N) i!, sum_(i=1 to N+1) i!) = 99 for N >= 10The question seems interesting, could you please make it clear with latex? 'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.' 'God exists because Mathematics is consistent, and the devil exists because we cannot prove it' 'Who are you to judge everything?' Alokananda #3 20121231 23:55:56
Re: GCD(sum_(i=1 to N) i!, sum_(i=1 to N+1) i!) = 99 for N >= 10I don't know how to input latex into this forum but I can tell you that if you enter 'sum_(i=1)^10 i! ; sum_(i=1)^11 i!' without quotes into the WolframAlpha website or iPhone/iPad app, you will see the desired equations and their GCD. Prime numbers have got to be the neatest things; they are like atoms. Composites are two or more primes held together by multiplication. In biology, we use math like we know what we are talking about. Sad isn't it. #4 20130101 01:44:33
Re: GCD(sum_(i=1 to N) i!, sum_(i=1 to N+1) i!) = 99 for N >= 10Latex here: 