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.

A239415 Numbers n such that n^7-7 is prime.

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%I A239415 #13 Dec 21 2022 16:16:58
%S A239415 60,66,132,212,242,246,290,296,312,326,380,384,446,516,524,554,654,
%T A239415 704,740,782,834,1026,1086,1142,1154,1172,1182,1214,1424,1430,1464,
%U A239415 1482,1494,1500,1524,1604,1682,1686,1752,1794,1796,1844,1854,1940,1952,1980,2000,2010
%N A239415 Numbers n such that n^7-7 is prime.
%C A239415 Note that all the numbers in this sequence are even.
%e A239415 60^7-7 = 2799359999993 is prime. Thus, 60 is a member of this sequence.
%t A239415 Select[Range[2500],PrimeQ[#^7-7]&] (* _Harvey P. Dale_, Dec 21 2022 *)
%o A239415 (Python)
%o A239415 import sympy
%o A239415 from sympy import isprime
%o A239415 {print(n) for n in range(10**4) if isprime(n**7-7)}
%Y A239415 Cf. A028870, A153974, A239344, A239413, A239414.
%K A239415 nonn
%O A239415 1,1
%A A239415 _Derek Orr_, Mar 17 2014