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15
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For $n,k \in {\mathbb{Z}}^{+}$ (excluding $n=1$), does $\frac{(n+k)!}{n!}$ ever equal $n!$

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#number-theory #oeis
156
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Gap in spiral sequence

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#sequences-and-series #oeis
69
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On an interesting assertion in the OeisWiki page on multiply-perfect numbers

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#elementary-number-theory #conjectures #divisor-sum #perfect-numbers #oeis
191
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Growth rate of primes vs. prime indexed primes

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#prime-numbers #oeis
64
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Why do these two sequences end in an increasing number of zeroes?

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#sequences-and-series #elementary-number-theory #modular-arithmetic #divisibility #oeis
58
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Number of unlabeled hypergraphs (A003180)

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#oeis #hypergraphs
74
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Crossing Number Graphs CN 9-13

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#graph-theory #oeis
29
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Recurrence for A000670

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#notation #recurrence-relations #bernoulli-numbers #oeis
33
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Intuitive geometric sequences (and where to find them in OEIS)

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#sequences-and-series #geometry #oeis
345
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Number of $n$-bead binary necklaces [OEIS-A000013]

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#combinatorics #oeis #necklace-and-bracelets
251
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Binary weight of OEIS sequence A308092.

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#sequences-and-series #binary #oeis
55
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Is there a specific terminology for numbers which are nontrivial multiples of triangular numbers?

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#sequences-and-series #elementary-number-theory #terminology #integers #oeis
84
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What properties does the ratio of two triangular numbers $M$ and $N$ have, assuming $N \mid M$?

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#sequences-and-series #elementary-number-theory #integers #pell-type-equations #oeis
240
Views

Where to publish proofs for, for example, the OEIS

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#publishing #oeis
358
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Computing Remy Sigrist sequence A279125

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#sequences-and-series #recursion #oeis

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