22656

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 75.at n=35A031573
• 53 'Reverse and Add' steps are needed to reach a palindrome.at n=10A065320
• Number of binary strings with n 1's and n 0's avoiding zigzags, that is avoiding the substrings 101 and 010.at n=12A078678
• a(n) = 13 + floor(Sum_{j=1..n-1} a(j)/3).at n=26A120157
• Numbers with prime signature {7,1,1}, i.e., of form p^7*q*r with p, q and r distinct primes.at n=29A179696
• Numbers that are 4-digit palindromes in at least 2 bases.at n=28A180453
• 1/7 the number of n X 2 0..6 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.at n=4A185405
• 1/7 the number of nX5 0..6 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.at n=1A185408
• T(n,k)=1/7 the number of nXk 0..6 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.at n=16A185409
• T(n,k)=1/7 the number of nXk 0..6 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.at n=19A185409
• Number of -2..2 arrays x(i) of n+1 elements i=1..n+1 with set{t,u,v in 0,1}((x[i+t]+x[j+u]+x[k+v])*(-1)^(t+u+v)) having three, four, six or seven distinct values for every i,j,k<=n.at n=8A211582
• Number of partitions of n with difference -4 between the number of odd parts and the number of even parts, both counted without multiplicity.at n=45A242688
• Number of (n+1) X (n+1) 0..1 arrays with every 2 X 2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.at n=6A253224
• Number of (n+1) X (7+1) 0..1 arrays with every 2 X 2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.at n=6A253230
• Number of (n+1)X(4+1) 0..1 arrays with every 2X2 subblock ne-sw antidiagonal difference unequal to its neighbors horizontally and nw+se diagonal sum unequal to its neighbors vertically.at n=10A253694
• E.g.f.: cosh( Integral exp(x^2) dx )^2.at n=4A280794
• a(n) = prime(n)*prime(n+1) + prime(n+2).at n=34A292926
• Number of Dean words of length n, i.e., squarefree reduced words over {0,1,2,3}.at n=20A343421
• Number T(n,k) of tilings of a 3k X n rectangle with right trominoes.at n=62A351322
• Number of tilings of a 7 X 3n rectangle with right trominoes.at n=3A351324