170723

Appears in sequences

• Numbers k such that k | 6^k + 1.at n=19A015953
• Number of fusenes with 25 hexagons, C_(2v) symmetry and containing n carbon atoms.at n=15A123598
• Number of (n+1)X(n+1) -6..6 symmetric matrices with every 2X2 subblock having sum zero and one, two or three distinct values.at n=9A211257
• Number of (n+1)X(2+1) 0..1 arrays x(i,j) with row sums sum{j^4*x(i,j), j=1..2+1} nondecreasing, and column sums sum{i^4*x(i,j), i=1..n+1} nondecreasing.at n=15A232791
• a(n) = 7*n^3.at n=29A244727