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Jul
10
comment Sum of square roots of integers
@barto Ohh truely yes. I should have noticed.
Jul
10
answered Sum of square roots of integers
Jul
10
comment Sum of square roots of integers
With $a+b=8$, right?
Jun
23
answered How to get from $\frac{n(n+1)}{2}$ to $n + \binom{n}{2}$?
May
23
comment Is my proof correct regarding the non primality of $2\cdot 17^a +1$?
@Lucian Thank you so much. That was really a helpful "linked" information for me.
May
23
comment Is my proof correct regarding the non primality of $2\cdot 17^a +1$?
Thank you for your advise.
May
22
comment Is my proof correct regarding the non primality of $2\cdot 17^a +1$?
@user142634 Ya, thats true. Actually while doing so even I also thought that but just for the continuation of typing, I didn't change 2a+1 and 2a-1. Thanks for response.
May
22
comment Is my proof correct regarding the non primality of $2\cdot 17^a +1$?
@MartinR I apologise for that. Edited now. Hope it is now perfect.
May
22
revised Is my proof correct regarding the non primality of $2\cdot 17^a +1$?
added 65 characters in body; edited title
May
22
asked Is my proof correct regarding the non primality of $2\cdot 17^a +1$?
May
18
accepted Is there any prize for proving conjecture on Fermat's prime ?-+
Apr
17
comment Is there any prize for proving conjecture on Fermat's prime ?-+
@AlexBecker Sir, Is there any website or any person who can give me answer for it?
Apr
17
asked Is there any prize for proving conjecture on Fermat's prime ?-+
Mar
22
comment Solutions of $\phi(x)=n$ for a given n.
@labbhattacharjee I apologize but did you provide any link in "here" ? I opened your math.stackexchange profile but could not get your contact id.
Mar
8
comment Solutions of $\phi(x)=n$ for a given n.
@lab bhattacharjee I need to contact with you regarding some discussion. Can you please mail me your contact id to my email id anjandebnath@rocketmail.com ?
Feb
17
comment solving $\int x^7\sqrt{3+2x^4}dx$
@V.Rossetto Opps !!! That was really indeed a mistake. Thank you so much for alerting me. I have done the editing. And also I apologise for such typing mistake.
Feb
17
revised solving $\int x^7\sqrt{3+2x^4}dx$
edited body
Feb
14
answered Incongruent solutions to $7x \equiv 3$ (mod $15$)
Feb
14
comment Evaluate $\int 7\tan^5x\sec^2 x\,dx$
Nice question. Well, note that the integrand is $\tan ^5 x\sec ^2 x dx$ (do not bother about 7, constant is not affected by integration so throw it out !). Now your substitution should be some thing so that its derivative will also be "adjusted". Here two trigonometric functions we can see , $\tan x$ and $\sec x$ with the powers 5 and 2 respectively. The derivative of $\tan x$ is $\sec ^2 x dx$ and THAT is already there. So if we choose $\tan x$ as $t$ then the whole integral will be converted to $\int t^5 dt$ which is standard integration. By choose $\sec x=t$ the result will be complicated
Feb
14
answered Evaluate $\int 7\tan^5x\sec^2 x\,dx$