71630

Appears in sequences

• Number of key permutations of length n: permutations {a_i} with |a_i - a_{i-1}| = 1 or 2.at n=25A003274
• Numbers k such that [A070080(k), A070081(k), A070082(k)] is an integer Heronian triangle having triangular area.at n=25A070148
• Numbers n such that sigma(n)/phi(n) = 25/4, where sigma = A000203, phi = A000010.at n=6A165629
• a(n) = (n-5)*(n-6)*(n-7)*(n-16)/24.at n=37A167543
• Number of length n+1 nonnegative integer arrays starting and ending with 0 with adjacent elements unequal but differing by no more than 5.at n=6A205338
• T(n,k)=Number of length n+1 nonnegative integer arrays starting and ending with 0 with adjacent elements unequal but differing by no more than k.at n=61A205341
• Number of length 8 nonnegative integer arrays starting and ending with 0 with adjacent elements unequal but differing by no more than n.at n=4A205345
• Smallest k such that the k-th tetrahedral number is divisible by exactly n tetrahedral numbers.at n=34A342808