Project Euler Forum

Is "no nothing" a typo for "do nothing"? Yes. Corrected. Shouldn't there be a floor function around the $\frac{7^K-1}{11}$ term? I don't think there is a universally accepted meaning for a sum where the upper limit for the index variable is not an integer. Please investigate if $\frac{7^K-1}{11}$ i...

Oops. I'm getting old ;-(
Well, trying to remember your password is the only way to recover your account as you didn't generate an account recovery key.
Hint: perhaps you changed your password last year.

I looked up your account: So it seems that you remembered your password after all.

(usually people find out their password after some head scratching.)

There's no bug.
When tshark solved #669 his account was unlisted. After solving #669 he made his account public again.
Please note that unlisted accounts can be made public again.

Account imstupid on projecteuler.chat deleted.

Please change that username. I'm not intending to remember that that isn't a suspicious username.
By not changing it you're taking the risk of being permanently delisted again.

Account FutureNerd on projecteuler.chat deleted.

Hi, I haven't logged into my account for a long while (10 years, I believe) after graduating from high school. I participated in OI/ACM/Topcoder/Codeforces at that time. The day before yesterday one of my current fellow students asked me about how to solve Problem 667 and I logged back, solved it i...

I think you overlooked the very first sentence of the problem:
'Here are the records from a busy telephone system with one million users:'

Apologies. Everything should be allright now.

This board is not meant to discuss solutions.
As made clear from the onset it is meant to resolve problems with understanding what is asked.
As far as I can see both of you understand perfectly what is asked.
Attemps to discuss things further will be deleted.

Did you do a forced reload of the page? (CTRL-F5) when on that page.
(The image might still be in the browser cache)

From Wikipedia:
"In mathematics, a subsequence is a sequence that can be derived from another sequence by deleting some or no elements without changing the order of the remaining elements'
See: https://en.wikipedia.org/wiki/Subsequence

The first two are correct. The second two not.

I can't reproduce the problem.

I sent you a PM.

If a triangle is n-pandigital for multiple n all of them are counted.

That can be restored by the users themselves in the Account tab.

JTJL wrote: ↑

Fri Mar 08, 2019 1:49 am

Hi, I found that I disappeared from Fastest Solvers list after style sheet update. I'm pretty sure that for problem 650, 651, 652, 653, 654 I'm in the top 100. Besides, I was also removed from Eulerians.

Problem solved (I hope).

Thanks Jaap.
I made it: Calculate the sum of $H_{100}(\sqrt \beta)$ for $\beta \in T$.