42146domain: NAppears in sequencesa(n) = Sum_{k=0..n} (k+1) * A026681(n, k).at n=11A026990Numbers k such that 6*k+5, 6*k+11, 6*k+17, 6*k+23 are consecutive primes.at n=37A090836Numbers k such that 5*10^k + 87 is prime.at n=31A271360