26408

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 81.at n=32A031579
• Number of 4-ary rooted trees with n nodes and height at most 6.at n=15A036611
• Numbers k such that 273*2^k + 1 is prime.at n=40A053353
• Number of 5 X 5 X 5 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.at n=21A166213
• a(n)=n if n <= 3, otherwise a(n) = A007477(n-1) + A007477(n).at n=15A213705
• Number of (n+1) X (2+1) 0..2 arrays with the minimum plus the maximum unequal to the lower median plus the upper median in every 2 X 2 subblock.at n=2A235905
• Number of (n+1)X(3+1) 0..2 arrays with the minimum plus the maximum unequal to the lower median plus the upper median in every 2X2 subblock.at n=1A235906
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the minimum plus the maximum unequal to the lower median plus the upper median in every 2X2 subblock.at n=7A235911
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the minimum plus the maximum unequal to the lower median plus the upper median in every 2X2 subblock.at n=8A235911
• Least number m such that there exist exactly n pairs of numbers (a,b), 0 < a < b < m, such that a+b, a+m, and b+m are all squares.at n=30A246766
• Numbers n such that n!!! + 3^n is prime.at n=33A261617