17179738112
domain: N
Appears in sequences
- a(n) = 4^n - 2^n.at n=17A020522
- Sum of every 4th entry of row n in Pascal's triangle, starting at "n choose 0".at n=36A038503
- Numbers k such that the sums of the odd and even aliquot parts of k both divide k.at n=6A065125
- a(n) = Sum_{k=0..n} binomial(4*n,4*k).at n=9A070775
- Numbers k such that there is a proper divisor d of k satisfying sigma(d)=k.at n=18A081756
- Admirable oblong numbers.at n=10A109547
- Twice even perfect numbers. Also a(n) = M(n)*(M(n)+1), where M(n) is the n-th Mersenne prime A000668(n).at n=5A139256
- Numbers k such that the maximal prime power divisors of k form a nontrivial run of integers.at n=13A141808
- Denominator of ez(n-1)*n!/(4^n-2^n) where ez(n) is the n-th coefficient of sec(t)+tan(t) for n>0, a(0) = 1.at n=17A193473
- a(n) = 4*16^n - 2*4^n.at n=8A193475
- The denominators of the Bernoulli secant numbers at odd indices.at n=8A193476
- Even numbers that divide the sum of their even divisors.at n=18A194771
- Numbers k such that the sum of reciprocals of even divisors of k is an integer.at n=12A224832
- Numbers that can be expressed as the product of largest odd proper divisor and the sum of odd proper divisors.at n=18A225880
- Oblong numbers n such that sigma(n) is a triangular number.at n=21A256150
- Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 213", based on the 5-celled von Neumann neighborhood.at n=33A279879
- Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 469", based on the 5-celled von Neumann neighborhood.at n=33A282417
- Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 165", based on the 5-celled von Neumann neighborhood.at n=33A286169
- Prime power Giuga numbers: composite numbers n > 1 such that -1/n + sum 1/p^k = 1, where the sum is over the prime powers p^k dividing n.at n=31A286497
- Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 493", based on the 5-celled von Neumann neighborhood.at n=33A288663