175081domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes with 31 as smallest positive primitive root.at n=20A061735Sums of the form (twin primes + 1) which are also an upper twin prime.at n=27A158870Sum of the trapezoid weights of all peakless Motzkin paths of length n (n>=0).at n=16A171853Prime numbersat n=15924