18850

Appears in sequences

• Numbers that are the sum of 2 nonzero squares in exactly 6 ways.at n=11A025289
• Numbers that are the sum of 2 nonzero squares in 5 or more ways.at n=17A025296
• Numbers that are the sum of 2 nonzero squares in 6 or more ways.at n=11A025297
• Numbers that are the sum of 2 distinct nonzero squares in exactly 6 ways.at n=11A025307
• Numbers that are the sum of 2 distinct nonzero squares in 5 or more ways.at n=15A025315
• Numbers that are the sum of 2 distinct nonzero squares in 6 or more ways.at n=11A025316
• a(n) = Sum_{k=0..n} (k+1) * A026626(n,k).at n=11A026965
• Denominators of the first differences of 1/(n^2 + 1).at n=17A033466
• a(n) in base 12 is a repdigit.at n=43A048336
• Expansion of g.f.: (1-x)/(1-3*x-2*x^3+2*x^4).at n=9A052958
• Numbers that define integer Heronian triangles [a(n), prime(a(n)), A068968(n)] with area A068969(n).at n=34A068967
• Numbers m that are the hypotenuse of exactly 22 distinct integer-sided right triangles, i.e., m^2 can be written as a sum of two squares in 22 ways.at n=12A097103
• a(n) = A033466(5n+2). Values of A033466(n) that differ from A058031(n+1)+1.at n=3A099024
• Beach-Williams Pell numbers of type 2pqrs (p,q,r,s primes).at n=0A212077
• Number of (w,x,y) with all terms in {0,...,n} and |w-x| + |x-y| != w+x+y.at n=26A213480
• Number of (w,x,y) with all terms in {0,...,n} and w != min(|w-x|, |x-y|, |y-w|).at n=26A213492
• Number of n X 4 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, vertically or antidiagonally.at n=5A232937
• Number of nX6 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, vertically or antidiagonally.at n=3A232939
• T(n,k)=Number of nXk 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, vertically or antidiagonally.at n=39A232941
• T(n,k)=Number of nXk 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, vertically or antidiagonally.at n=41A232941