81549

Appears in sequences

• Enneagonal numbers divisible by 9.at n=34A117796
• Numbers n such that n and n+-1 have 4 distinct prime factors.at n=19A168628
• a(n) = n*(n + 7)*(n + 14)*(n + 21)*(n + 28)/120.at n=13A264449
• Number of 3 X n binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing.at n=15A266429
• Numbers k such that k and k+1 both have the prime signature (2,1,1,1) (A189982).at n=27A336658
• a(n) is the numerator of coefficient of x^n in expansion of (1 + x)^(1/n).at n=6A364713