296310domain: NAppears in sequencesNumbers k such that 2k+1, 4k+1, 6k+1, 8k+1 and 10k+1 are primes.at n=18A124410a(0)=1, a(n) = (3n-1)*3n*(3n+1)/2 for n>0.at n=28A15702418522n - 42.at n=15A157738Smallest fixed points (>0) of the base-2*n Kaprekar map.at n=41A319839