cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A367561 Numbers k such that k^7*2^k - 1 is a prime.

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%I A367561 #15 Aug 29 2024 00:52:08
%S A367561 6,45,55,80,135,187,205,384,405,1291,1364,2301,2486,2844,16892,27308,
%T A367561 30152,32535,45324,71522,72865
%N A367561 Numbers k such that k^7*2^k - 1 is a prime.
%C A367561 No further terms <= 100000. - _Michael S. Branicky_, Aug 28 2024
%t A367561 Select[Range[3000], PrimeQ[#^7*2^# - 1] &] (* _Amiram Eldar_, Nov 23 2023 *)
%o A367561 (Magma) [k: k in [1..4000] | IsPrime(k^7*2^k-1)];
%Y A367561 Numbers k such that k^m*2^k - 1 is a prime: A000043 (m = 0), A002234 (m = 1), A058781 (m = 2), A367037 (m = 3), A367102 (m = 4), A367464 (m = 5), A367478 (m = 6), this sequence (m = 7).
%Y A367561 Cf. A367560.
%K A367561 nonn,more
%O A367561 1,1
%A A367561 _Juri-Stepan Gerasimov_, Nov 22 2023
%E A367561 a(16)-a(21) from _Michael S. Branicky_, Nov 23 2023