19825

Appears in sequences

• Sum of odd Fermat coefficients rounded to nearest integer.at n=13A000968
• Crystal ball sequence for 6-dimensional cubic lattice.at n=7A001848
• Crystal ball sequence for 7-dimensional cubic lattice.at n=6A001849
• a(n) = Sum_{k=0..n-1} binomial(n,k+1) * binomial(n+k,k).at n=7A002002
• a(n) = (n+2)*(n+1)*(n^2 + 7*n - 12)/24.at n=23A014309
• Powers of fourth root of 21 rounded to nearest integer.at n=13A018106
• Powers of fourth root of 21 rounded up.at n=13A018107
• Strong pseudoprimes to base 32.at n=28A020258
• Strong pseudoprimes to base 93.at n=19A020319
• Numbers that are the sum of 2 nonzero squares in exactly 6 ways.at n=12A025289
• Numbers that are the sum of 2 nonzero squares in 5 or more ways.at n=18A025296
• Numbers that are the sum of 2 nonzero squares in 6 or more ways.at n=12A025297
• Numbers that are the sum of 2 distinct nonzero squares in exactly 6 ways.at n=12A025307
• Numbers that are the sum of 2 distinct nonzero squares in 5 or more ways.at n=16A025315
• Numbers that are the sum of 2 distinct nonzero squares in 6 or more ways.at n=12A025316
• a(n) = T([n/2],[(n+1)/2]), where T = Delannoy triangle (A008288).at n=13A026003
• Numbers k such that 219*2^k+1 is prime.at n=38A032486
• 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=13A097103
• E.g.f.: (1/(1-x^5))*exp( 5*sum_{i>=0} x^(5*i+1)/(5*i+1) ) for an order-5 linear recurrence with varying coefficients.at n=6A097680
• Coefficients in a certain Poincaré series [or Poincare series].at n=28A098705