76359domain: NAppears in sequencesT(n,n-3), array T as in A054120.at n=26A054121Expansion of e.g.f.: sqrt(exp(5*x)/(2-exp(x))).at n=7A054912Numbers k such that k*(k+1)-1 and k*(k+1)+1 are twin primes and k*(k+3)-1 and k*(k+3)+1 are also twin primes.at n=29A138303