27217

Appears in sequences

• Numbers n such that 2*10^n + 3 is prime.at n=19A081677
• Triangular array read by rows: T(n,1) = T(n,n) = 1, T(n,k) = 3*T(n-1,k-1) + 2*T(n-1,k).at n=40A119725
• Generalized Markoff numbers: largest of 7-tuple of positive numbers a, b, c, d, e, f, g satisfying the Markoff(7) equation a^2+b^2+c^2+d^2+e^2+f^2+g^2 = 3abcdefg.at n=34A227211
• Number of 2 X 2 0..n arrays with rows and columns in lexicographically nondecreasing order.at n=15A229795
• Number of partitions p = [x(1), ..., x(k)], where x(1) >= x(2) >= ... >= x(k), of n such that max(x(i) - x(i-1)) > number of parts of p.at n=49A241832
• a(n) = n*(6*n^2 - 8*n + 3).at n=17A272378
• a(n) = n! * Sum_{k=0..floor(n/5)} (n/5)^k / (k! * (n-5*k)!).at n=9A362319
• Numbers k such that sigma(k) = phi(k) + tau(k)^4 + pi(k).at n=2A390773