280900

Appears in sequences

• Palindromic squares in base 16.at n=12A029734
• Main diagonal of A082043: a(n) = n^4 + 2*n^2 + 1.at n=23A082044
• Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 0 and 1 1 1 vertically.at n=16A209220
• Number of city-block distance 1, pressure limit 2 movements in an n X n array with each element moving exactly one horizontally or vertically, no element acquiring more than two neighbors, and without 2-loops.at n=3A216984
• Number of city-block distance 1, pressure limit 2 movements in an nX4 array with each element moving exactly one horizontally or vertically, no element acquiring more than two neighbors, and without 2-loops.at n=3A216987
• T(n,k)=Number of city-block distance 1, pressure limit 2 movements in an nXk array with each element moving exactly one horizontally or vertically, no element acquiring more than two neighbors, and without 2-loops.at n=24A216991
• Numbers n such that (the sum of the divisors of n) plus (the sum of the squares of the divisors of n) plus (the sum of the cubes of the divisors of n) is a prime number.at n=19A220586
• The smaller of a pair of successive powerful numbers (A001694) without any prime number between them.at n=31A240591
• a(n) is the smallest dividend m of the Euclidean division m = d*n + r such that m/d = r/n.at n=21A335717
• a(n) = sigma_2(n)^2.at n=22A356533
• a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(j)*phi(k).at n=40A372635