[qfqxmkuw] Emergency battery interface

A door lock with an electrical component will fail to function if it doesn't have electricity, for example, if its batt

[axuqcsaj] Primes 2 away from a perfect power

Numbers of the form b^n +/- 1 get a lot of attention (Fermat primes, Mersenne primes, Cunningham project).  We go

[plxztbea] Pierpont primes with primitive root 2

Pierpont primes have the form 1 + 2^a * 3^b.  We restrict our attention to the subset of Pierpont primes for which

[dyrnrrin] Quick partial factorization and isprimroot in Pari/GP

\\ return the last composite in a possibly incomplete factorization, or 2 if it is a complete prime factorization. 

[fneixtxj] Multiplicative groups of some primes below 2^127

Here is some Pari/GP (Version 2.9.4) code calculating the 64 largest primes less than 2^127, a 39-digit number.  T