20610

Appears in sequences

• Number of labeled monoids of order n.at n=4A058153
• Numbers n such that 7*3^n - 2 is prime.at n=31A058605
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,7.at n=20A064240
• Smaller side not divisible by 37 of right triangles with integer sides and integer side inscribed squares with two vertices on the hypotenuse.at n=25A123697
• Numbers n that raised to the powers from 1 to k (with k>=1) are multiple of the sum of their digits (n raised to k+1 must not be a multiple). Case k=13.at n=7A135198
• a(n) = 729*n - 531.at n=28A156771
• Number of nX1 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to one or two horizontal or vertical neighbors.at n=21A199034
• Expansion of (x^5-x^4-2*x^3+x^2-x)/(-x^4+x^3-2*x^2+3*x-1).at n=13A265106
• Number of nXnXn triangular 0..6 arrays with new values introduced in sequential zero-upwards order and exactly one 2x2x2 triangle having values all equal.at n=3A271074
• T(n,k)=Number of nXnXn triangular 0..k arrays with new values introduced in sequential zero-upwards order and exactly one 2x2x2 triangle having values all equal.at n=39A271075
• Array read by antidiagonals: T(n,k) is the number of n X n nonnegative integer matrices with sum of elements equal to k, up to rotational symmetry.at n=61A343874