81648
domain: N
Appears in sequences
- Period of 1/n! in base 10.at n=17A000976
- Period of 1/n! in base 10.at n=19A000976
- Period of 1/n! in base 10.at n=18A000976
- Triangle of coefficients in expansion of (2+3x)^n.at n=42A013620
- Number of noninvertible 2 X 2 matrices over Z/nZ (determinant is a divisor of 0).at n=16A020479
- Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*2^j.at n=38A038220
- Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*4^j.at n=30A038222
- Triangle whose (i,j)-th entry is binomial(i,j)*4^(i-j)*3^j.at n=33A038233
- 3^(n-3)*n*(n-1)*(n-2).at n=8A052791
- Card-matching numbers (Dinner-Diner matching numbers).at n=14A059059
- Card-matching numbers (Dinner-Diner matching numbers).at n=14A059067
- Digital sum of n = sum of palindromes from the smallest prime factor of n to the largest prime factor of n.at n=27A074310
- Riordan array (1,3+2x).at n=63A099095
- Numbers k such that phi(k) + k is a fourth power.at n=30A114072
- Smallest number having at least n divisors and a prime power as n-th divisor.at n=43A119311
- Numbers k such that the number of prime divisors of the k-th Catalan number (counted with multiplicity) divides k.at n=44A121612
- Averages of twin prime pairs k such that k*7 and k/7 are squares.at n=4A154673
- Totally multiplicative sequence with a(p) = 9*(p+2) for prime p.at n=19A167310
- Coefficients of expansion polynomials related to fish weight allometric equation: p(x,t)=-Exp[t*x]*(1 - Exp[t/3])^3.at n=20A171506
- Numbers k such that tau(phi(k)) = rad(k).at n=22A173618