41019

Appears in sequences

• Composite numbers with four prime factors (not necessarily distinct) whose concatenation yields a palindrome.at n=17A046453
• Triangle T(n, k) = n!*Sum_{j=k..n} (-1)^(j+k)*binomial(k+j, j)/j!, read by rows.at n=42A156984
• Least number having n orderless representations as p^2 + q^2 + r^2, where p, q, and r are primes.at n=20A214512
• Number of idempotent 3X3 -n..n matrices of rank 1.at n=15A221312
• a(n) = Sum_{i=0..n} digsum(i)^4, where digsum(i) = A007953(i).at n=22A231689
• a(n) is the number of symmetric domino towers with n bricks.at n=21A320314