68816

Appears in sequences

• a(n) = T(7,n), array T given by A048505.at n=9A048512
• Structured disdyakis triacontahedral numbers (vertex structure 11).at n=15A100158
• The minimum excess in the prime race of odious primes versus evil primes in the interval (2^(n-1),2^n).at n=22A127977
• Sum of all the parts in the partitions of n into 10 squarefree parts.at n=46A326627
• Least k such that p = k^2 + 1 and q = (k+2n)^2 + 1 are prime numbers with q - p square.at n=33A339007
• G.f. A(x,y) satisfies: x*y = Sum_{n=-oo..+oo} (-1)^n * x^(n*(n+1)/2) * A(x,y)^n, with coefficients T(n,k) of x^n*y^k in A(x,y) given as a triangle read by rows.at n=58A355350
• Triangle read by rows: the almost-Riordan array ( 1/(1-x) | 2/((1-x)*(1+x+sqrt(5*x^2-6*x+1))), (1-3*x-sqrt(5*x^2-6*x+1))/(2x) ).at n=59A373746
• a(n) is the number of 5 element sets of distinct integer-sided trapezoids each of area less than 3*n^2 whose base angles are 60 degrees that fill a regular hexagon of side n units.at n=46A390763