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I know no one cares about this, but it has to be posted because it is pretty amazing. I don't know where else to post it. By some miracle, Australia has managed to get another perfect score in an international olympiad this year, as well as another gold medal and 2 silvers. Ishraq Huda from...

SO PROUD OF MY BOY but Your file doesn't list all the numbers up to 10k because your program terminates before it's finished writing. Close your PrintWriter with writ.close() when you're done with it. Your factorList function is broken for multiples of 4. You want the for-loop limit to be...

The stupendous brilliance of Alex's achievement can't be understated. This means he's one of the best mathematicians in the world in the under-20s age range. My claim to fame from here onwards is that I once played cards with him. And HE'S IN YEAR 11 WTF. HE STILL HAS ONE MORE YEAR

Part B, for those who've done a discrete maths course: Alice and Bob are looking at a large graph G. Bob claims that the graph contains a Hamiltonian cycle, but doesn’t want to reveal any information about the cycle (e.g. whether any particular edge in G is in the cycle) to Alice. By...

I know how much y'all like logic puzzles... Alice and Bob are playing a game in a sealed empty room. Alice is blindfolded and Bob gives her two marbles of identical size, weight and texture. Bob claims that the marbles are of different colours, but Alice believes they are identical. By...

Oh I didn't know about the Dean's Award. I guess that fulfills my criteria for exclusivity. Still, I don't see how you can compare being in the top 5% of a cohort to achieving a state rank. To get a state rank you have to be in the top 0.1%-0.5%. The top 5% of ASB students almost certainly...

100% serious To be an all-rounder, you just have to do well in most of your subjects. There are no limitations on how many people get it, so it's not competitive. I know plenty of students who were good but not great in their subjects, who got all-rounders with marks in the low 90s. To get a...

For another problem about integer chains that deals with exactly the same concepts at a much much higher level, see Euler 425.

There are a number of problems with this approach!! (I'm still very excited) Problem 1 is that one of the branches of the tree will go 1 -> 2 -> 4 -> 8 -> 16 -> ... which is valid, but your program could easily keep exploring down this branch forever. "But can't you just tell it to stop at 1...

doubles are 64 bit data types, so it does explain it... As someone else pointed out, the maximum value attained during iteration is above 2^31. It's 28495741760. Your integers were overflowing and then weird stuff happened. doubles don't overflow like this. In future, use java.math.BigInteger...

All rounder is piss easy. State rank is crazy hard EDIT: dean's list is easier than both...

Words cannot contain my excitement at seeing a PROJECT EULER PROBLEM ON BOREDOFSTUDIES I'M SO HAPPY

3u is just 2u with more content. There's no expectation of more rigour or more advanced mathematical thinking. The jump from 3u to 4u, on the other hand...

I know that n has to be a natural number, but you didn't say that. You said "the nth term is some arbitrary number in the set of N". This is wrong. The nth term of an arithmetic progression can be negative, fractional, etc. as in the progression -1, -0.5, 0, 1.5. ... The set of natural numbers...

It's really not. What is N? The only valid interpretation I have is that N the set of natural numbers, which is wrong. In general, the nth term of an arithmetic progression doesn't have to be a natural number or even an integer. If you don't mean N to be N the set of natural numbers, then what...

Squar3root's answer is confused. Here, n is a pronumeral representing a positive integer. The nth term of the arithmetic progression is the term that comes in the nth position, expressed in terms of the pronumeral n. For example, the 1st term (i.e. the term when n=1) is 7. The 2nd term (n=2) is...

I think that should read "T is linearly dependent".

Making an IRC bot is a really cool project. E.g. one to play hangman.

Duuuuude what's up? What's happening in your life?

Holy crap