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 A091282 #15 Jun 06 2024 03:49:35 %S A091282 0,3,3,4,3,3,5,3,4,3,6,3,4,3,5,3,3,3,3,4,4,5,3,4,6,3,4,3,3,5,8,3,4,3, %T A091282 3,4,3,3,4,3,3,3,7,7,3,4,3,6,3,3,4,5,5,3,9,4,3,5,3,4,3,3,3,4,4,3,3,5, %U A091282 3,3,6,4,5,3,3,8,3,3,5,4,3,3,5,5,4,3,7,4,3,5,3,6,4,3,3,4,3,4,3,3,3,3,3,4,3 %N A091282 Exponent of 2 in prime(n)^2 - 1. %C A091282 Also, exponent of 2 in -1+prime(n)^s if s is an exponent of the form 4k+2 (previous definition). - _Michel Marcus_, Dec 20 2013 %C A091282 Primes that give records for this sequence can be found in A233930. - _Michel Marcus_, Dec 20 2013 %H A091282 Amiram Eldar, <a href="/A091282/b091282.txt">Table of n, a(n) for n = 1..10000</a> %F A091282 a(n) = A023506(n) + A023512(n). - _Amiram Eldar_, Jun 06 2024 %e A091282 a(1)=0 since -1+2^s is always odd... %t A091282 IntegerExponent[Prime[Range[100]]^2 - 1, 2] (* _Amiram Eldar_, Jun 06 2024 *) %o A091282 (PARI) a(n) = valuation(prime(n)^2-1, 2); \\ _Michel Marcus_, Dec 20 2013 %Y A091282 Cf. A007814, A023506, A023512, A091283, A091284. %K A091282 nonn %O A091282 1,2 %A A091282 _Labos Elemer_, Jan 20 2004 %E A091282 Definition modified by _Michel Marcus_, Dec 20 2013