139139domain: NAppears in sequencesDouble primes: concatenation of the n-th prime with itself.at n=33A176597Expansion of (1+x)^4/(1-x)^7.at n=12A191596Third differences of A000219.at n=26A191661Numerators of the partial alternating sums of the reciprocals of the powerful part function (A057521).at n=45A379585