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New posts in arithmetic-progressions
Prove that there are infinitely many primes with $666$ in their decimal representation without Dirichlet's theorem.
number-theory
elementary-number-theory
prime-numbers
arithmetic-progressions
Proof by induction that $ \sum_{i=1}^n 3i-2 = \frac{n(3n-1)}{2} $ [closed]
summation
proof-writing
induction
arithmetic-progressions
Dirichlet's theorem on primes in arithmetic progression
number-theory
prime-numbers
arithmetic-progressions
How can you prove that $1+ 5+ 9 + \cdots +(4n-3) = 2n^{2} - n$ without using induction?
summation
induction
arithmetic-progressions
Why is sum of a sequence $\displaystyle s_n = \frac{n}{2}(a_1+a_n)$?
summation
arithmetic-progressions
How to find a general sum formula for the series: 5+55+555+5555+.....?
sequences-and-series
summation
arithmetic-progressions
geometric-progressions
$\sum \cos$ when angles are in arithmetic progression [duplicate]
trigonometry
summation
arithmetic-progressions
Proof $1+2+3+4+\cdots+n = \frac{n\times(n+1)}2$
sequences-and-series
algebra-precalculus
summation
arithmetic-progressions
faq
How can we sum up $\sin$ and $\cos$ series when the angles are in arithmetic progression?
trigonometry
summation
arithmetic-progressions
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