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Results tagged with integer-sequences
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user 3272
For questions about sequences of integers. References are often made to the online resource oeis.org.
39
votes
Accepted
Parity of the multiplicative order of 2 modulo p
This problem was asked by Sierpiński in 1958 and answered by Hasse in the 1960s.
For each nonzero rational number $a$ (take $a \in \mathbf Z$ if you wish) and each prime $\ell$, let $S_{a,\ell}$ be th …
- 50.6k
5
votes
Longest coinciding pair of integer sequences known
By searching OEIS for the list 1,2,4,8,16, I found the following examples of sequences that start out as 1, 2, 4, 8, 16, but do not equal the sequence of powers of 2.
For $n \geq 1$, mark $n$ equa …
- 50.6k