20060

Appears in sequences

• Quadrinomial coefficients.at n=15A005719
• Numbers such that the digital sum base 2 and the digital sum base 5 and the digital sum base 10 all are equal.at n=16A135125
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 6.at n=18A136883
• a(n) = 225*n^2 - 251*n + 70.at n=10A156810
• Number of 4's in the last section of the set of partitions of n.at n=46A182714
• Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and w+x+y>=0.at n=17A211612
• G.f. satisfies: A(x) = Sum_{n>=0} x^n * A(x)^(n^2) / (1 + x*A(x)^n)^n.at n=9A221585
• Numbers n such that the sum of first n prime powers (A025475) is divisible by n.at n=8A225791
• Numbers k such that the concatenation of k 1's, the digits of k^2 + k + 1, and k 1's is prime.at n=13A261459
• Numbers of squares and rectangles of all sizes in 3*n*(n+1)/2-ominoes in form of three-quarters of Aztec diamonds.at n=15A338996
• a(n) is the largest number of distinct integer-sided right triangles in which some n-digit number can appear as the length of a side.at n=8A354048