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.
%I A108975 #19 May 23 2024 06:29:52 %S A108975 3,15,165,2145,40755,1181895,43730115,2317696095,136744069605, %T A108975 8341388245905,558873012475635,46386460035477705,4685032463583248205, %U A108975 501298473603407557935,65670100042046390089485,9128143905844448222438415,1360093441970822785143323835,221695231041244113978361785105 %N A108975 Partial products of primes with primitive root 2. %C A108975 The poster by Arnold and Monagan reports that the cyclotomic polynomial of order a(6) is the first cyclotomic polynomial whose height is greater than its order. They also report the height of the cyclotomic polynomial Phi(a(7),x) is greater than the order squared. It is also true that k = a(5) is the least order such that the height of Phi(k,x) is greater than the square root of the order. - _T. D. Noe_, Apr 22 2008 %C A108975 Partial products of A001122. - _Charles R Greathouse IV_, Jun 21 2013 %H A108975 Andrew Arnold and Michael Monagan, <a href="http://www.cecm.sfu.ca/research/posters/arnold07.pdf">The Height of the 3,234,846,615th Cyclotomic Polynomial is Big (2,888,582,082,500,892,851)</a>. %e A108975 3 is the first prime with primitive root 2, so a(1) = 3. %e A108975 5 is the second prime with primitive root 2, so a(2) = 3*5 = 15. %e A108975 11 is the third prime with primitive root 2, so a(3) = 3*5*11 = 165. %t A108975 FoldList[Times, Select[Prime[Range[40]], PrimitiveRoot[#] == 2 &]] (* _Amiram Eldar_, May 23 2024 *) %Y A108975 Cf. A001122. %K A108975 nonn %O A108975 1,1 %A A108975 Douglas Stones (dssto1(AT)student.monash.edu.au), Jul 27 2005 %E A108975 More terms from _Amiram Eldar_, May 23 2024