31280

Appears in sequences

• Diagonal in array of n-gonal numbers A081422.at n=31A081435
• Terms of A061047 ending in 0.at n=34A146950
• Number of arrangements of n+1 nonzero numbers x(i) in -3..3 with the sum of trunc(x(i)/x(i+1)) equal to zero.at n=5A189539
• T(n,k)=Number of arrangements of n+1 nonzero numbers x(i) in -k..k with the sum of trunc(x(i)/x(i+1)) equal to zero.at n=33A189545
• Number of arrangements of 7 nonzero numbers x(i) in -n..n with the sum of trunc(x(i)/x(i+1)) equal to zero.at n=2A189550
• Number of (n+2)X(5+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and column plus the two sums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=31A259003
• Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000101.at n=12A259767
• a(n) = A289670(n)/2^f(n), where f(n) = 2*floor((n-1)/3) + ((n+2) mod 3).at n=49A289676
• a(n) = A289676(3*n+2).at n=16A290437
• Expansion of (theta_3(z)*theta_3(23z) + theta_2(z)*theta_2(23z))^6.at n=15A328094