161340domain: NAppears in sequencesNumbers k such that (k-1, k+1) and (k/2-1, k/2+1) are both pairs of twin primes.at n=25A076504a(n) is the number of representative six-color bracelets (necklaces with turning over allowed; D_6 symmetry) with n beads, for n >= 6.at n=5A292223