67092481
domain: N
Appears in sequences
- a(n) = (2^n - 1)^2.at n=12A060867
- Smallest square which is one more than the product of n (not necessarily distinct) numbers > 1.at n=16A081949
- Smallest square which is one more than the product of n (not necessarily distinct) numbers > 1.at n=17A081949
- Smallest square which is one more than the product of n (not necessarily distinct) numbers > 1.at n=18A081949
- Expansion of (1 + 2*x^2)/((1 + x)*(1 - 2*x)*(1 - 2*x^2)).at n=25A085903
- Smallest square k == 1 (mod some n-th power), k > 1.at n=13A088037
- a(2*n) = -(2^(2*n+1) + 1), a(2*n+1) = (2^(n+1) - (-1)^n)^2.at n=25A105951
- Squares of Mersenne primes A000668(n).at n=4A133049
- Semiprimes that are a product of Mersenne primes.at n=22A144482
- a(n) = 1+4^(n+1)-4*(-2)^n.at n=12A171590
- (2^p-1)^2 where p is prime.at n=5A174744
- Prime powers p (A025475) such that the sum of the proper divisors of p is also a prime power.at n=5A228018
- Product of lowest and highest prime factors of 2^n-1.at n=11A249780
- Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 5", based on the 5-celled von Neumann neighborhood.at n=12A270007
- Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 73", based on the 5-celled von Neumann neighborhood.at n=12A270088
- Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 89", based on the 5-celled von Neumann neighborhood.at n=12A270130
- Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 659", based on the 5-celled von Neumann neighborhood.at n=12A273385
- Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 913", based on the 5-celled von Neumann neighborhood.at n=12A273767
- Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 969", based on the 5-celled von Neumann neighborhood.at n=12A273848
- Number of holes in a sheet of paper when you fold it n times and cut off the four corners.at n=26A274230