412806domain: NAppears in sequencesNumbers representable in exactly two ways as (p-1)*p^e (where p is a prime and e >= 0) in ascending order.at n=32A114874a(n) = (p+2)!/p! where p is the n-th lesser twin prime, A001359(n).at n=28A126251Totients congruent to 2 mod 4 and that have multiplicity 4.at n=15A334839