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Posts tagged number-theory

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Q&A Prove that 49 is the only prime square to be followed by twice a prime square and then a semiprime

0 answers · posted 4mo ago by Peter Taylor‭ · edited 4mo ago by Peter Taylor‭

Question number-theory integer-sequences

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Q&A Show that $\forall n \in \mathbb{Z}^{+}$, $25^n \equiv 25 \bmod{100}$.

2 answers · posted 8mo ago by Carefree Explorer‭ · edited 8mo ago by Peter Taylor‭

Question number-theory recreational-mathematics modular-arithmetic

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Q&A Proving that $p\mid (p+1776)$ if $p$ is a prime and $p(p+1776)$ is a perfect square

2 answers · posted 9mo ago by Snoopy‭ · last activity 9mo ago by Snoopy‭

Question number-theory algebra

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Q&A Why are you permitted to define $1 − 1 + 1 − 1 + . . .$?

1 answer · posted 2y ago by Chgg Clou‭ · last activity 2y ago by JRN‭

Question number-theory

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Q&A Normal in one base and not in another?

0 answers · posted 2y ago by Grove‭

Question number-theory normal bases

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Q&A Why does the decimal expansion of $1/(10n - 1)$ have this neat pattern?

3 answers · posted 2y ago by The Amplitwist‭ · last activity 2y ago by celtschk‭

Question number-theory high-school-mathematics

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Q&A Can we adapt Furstenberg's proof of the infinitude of primes to other interesting subsets of the integers?

0 answers · posted 2y ago by HDE 226868‭ · edited 2y ago by msh210‭

Question number-theory topology

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Q&A Asymptotics of counting integers by prime signature

1 answer · posted 2y ago by Peter Taylor‭ · last activity 2y ago by Derek Elkins‭

Question number-theory