23660

Appears in sequences

• a(n) = 6*a(n-1) - a(n-2) + 2 with a(0) = 0, a(1) = 3.at n=6A001652
• a(1) = 5; a(n+1) = a(n)-th nonprime, where nonprimes begin at 0.at n=41A025001
• a(n) = (n+1)*binomial(n+4, 4).at n=12A027800
• Numbers that are divisible by 10 and are differences between two cubes in at least one way.at n=30A038854
• Expansion of 4*x/((1+x)*(1-6*x+x^2)).at n=6A046729
• Expansion of 1/((1 - x)*(1 - 2*x - x^2)).at n=11A048739
• Starting positions of strings of 3 1's in the decimal expansion of Pi.at n=24A050209
• Numbers k such that sigma(k+1) = 5*phi(k).at n=6A067263
• Number of 12 X n binary arrays with path of adjacent 1's from upper right corner to lower left corner.at n=1A069334
• Duplicate of A046729.at n=6A089498
• Duplicate of A048739.at n=11A090757
• Expansion of g.f. (1-x-x^2)/(1-x-3*x^2-x^3).at n=13A097075
• Sum[k=0..n, Sum[i>=0, C(2n,n-i(k+2))-C(2n,n+i(k+2)+k+1) ]].at n=7A101476
• a(n) = 2*a(n-1) + 2*a(n-3) + a(n-4), a(0) = 1, a(1) = 4, a(2) = 9, a(3) = 20.at n=11A111587
• Pythagorean triples of nearly isosceles triangle.at n=15A114336
• 13 times pentagonal numbers: a(n) = 13*n*(3*n-1)/2.at n=35A153793
• Row sums of A181657.at n=22A181658
• Coefficient of x^n in the expansion of (1+x^3+x^4)^n.at n=16A192442
• Numbers whose sum of triangular divisors is also a divisor and greater than 1.at n=31A209311
• a(n) = n^3 - floor(n/3)^3.at n=29A213039