361730domain: NAppears in sequencesGreedy frac multiples of Pi^2/6: a(1)=1, Sum_{n>=1} frac(a(n)*x) = 1 at x = Pi^2/6.at n=14A079937Composite squarefree numbers n such that p+d(n) divides n+d(n), where p are the prime factors of n and d(n) the number of divisors of n.at n=3A228299Even Quasi-Carmichael numbers.at n=16A262252