87500

Appears in sequences

• a(n) = Sum_{k=0..n} (k+1) * T(n,k), with T given by A026386.at n=12A026955
• Numbers k such that A174141(k) is divisible by k.at n=42A032581
• Hypotenuses for which there exist exactly 5 distinct Pythagorean triangles.at n=19A084649
• The n-th arithmetic derivative of 5^6.at n=4A129152
• Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 1 local maximum.at n=5A159727
• 3 X 3 X 3 triangular graph without horizontal edges coloring a rectangular array: number of n X 1 0..5 arrays where 0..5 label nodes of a graph with edges 0,1 0,2 1,3 1,4 2,4 2,5 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph.at n=12A223346
• Coefficients of (x^(1/5)*d/dx)^n for positive integer n.at n=33A223535
• Digits of n' end in n, where n' is the arithmetic derivative of n.at n=1A249540
• Numbers k such that k' = concat(s,t) and k = s*t, where k' is the arithmetic derivative of k.at n=6A272780
• Number of permutations of n elements divided by the number of quaternary heaps on n+1 elements.at n=29A273732
• Terms of A301517 that are not exponentially odd numbers (A268335).at n=7A335989
• a(n) is the conjectured largest number such that both a(n) and a(n) - n are 7-smooth numbers. a(n) can be less than n. Otherwise, if no such number exists then a(n) = 0.at n=19A376924