261121

Appears in sequences

• Squares composed of digits {1,2,6}.at n=4A053883
• a(n) = (2^n - 1)^2.at n=8A060867
• a(n) = F(n)-1 mod 2^n+1 with F(n) = n-th Fermat number = 1+2^2^n.at n=18A066808
• Numbers k having exactly one divisor d such that in binary representation d and k/d have the same number of 1's as k.at n=22A080026
• Smallest square which is one more than the product of n (not necessarily distinct) numbers > 1.at n=12A081949
• Expansion of (1 + 2*x^2)/((1 + x)*(1 - 2*x)*(1 - 2*x^2)).at n=17A085903
• Smallest square k == 1 (mod some n-th power), k > 1.at n=9A088037
• a(2*n) = -(2^(2*n+1) + 1), a(2*n+1) = (2^(n+1) - (-1)^n)^2.at n=17A105951
• A modified Legendre-binomial transform of 2^n for p=3.at n=17A117981
• a(n) = 1+4^(n+1)-4*(-2)^n.at n=8A171590
• The numbers n^2 as n runs through the numbers which are palindromes in base 2.at n=46A192775
• Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.at n=5A208102
• Number of nX6 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.at n=5A208106
• Number of 6 X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.at n=5A208111
• Hilltop maps: number of n X 3 binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..2 n X 3 array.at n=5A218314
• Hilltop maps: number of nX6 binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..2 nX6 array.at n=2A218317
• T(n,k)=Hilltop maps: number of nXk binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..2 nXk array.at n=30A218319
• T(n,k)=Hilltop maps: number of nXk binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..2 nXk array.at n=33A218319
• Hilltop maps: number of nX3 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..3 nX3 array.at n=5A218367
• Hilltop maps: number of n X 6 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..3 n X 6 array.at n=2A218370