20013

Appears in sequences

• Concatenations C1 and C2 and C3 and C4 are all prime (see the comment lines).at n=9A034819
• Least natural number n in increasing order such that the sum of decimal digits is equal to A001223(n).at n=36A179462
• Number of ways to arrange 3 nonattacking knights on the lower triangle of an n X n board.at n=9A194487
• Congruence-uniform lattices on n unlabeled nodes.at n=12A292790
• Number of terms of A048103 found in range A002110(n-1) .. A002110(n)-1.at n=5A328402
• Number of even-length strict integer partitions of 2n+1.at n=36A343942
• Number of strict odd-length integer partitions of 2n + 1.at n=36A346634
• Number of unlabeled semidistributive lattices with n elements.at n=12A377408