19933

Appears in sequences

• a(n) = floor(n(n-1)(n-2)(n-3)/18).at n=26A011928
• Super-4 Numbers (4 * n^4 contains substring '4444' in its decimal expansion).at n=16A032744
• Row 3 of array in A047666.at n=30A047667
• a(n) = 1^n + 5^n + 7^n.at n=5A074517
• Sum of 5th powers of proper divisors of n.at n=34A279364
• Number of nX3 0..1 arrays with every element unequal to 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=8A317891
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=57A317896
• Numbers k such that A000081(k) is divisible by k.at n=7A336039
• Sum of the 5th powers of the odd proper divisors of n.at n=34A352033
• a(n) is the index of the least n-gonal number that is the sum of two or more consecutive nonzero n-gonal numbers in more than one way, or -1 if no such number exists.at n=4A360777
• Numbers k such that A361338(k) = 10.at n=4A361349