507904

Appears in sequences

• Number of Pythagorean triples mod 2^n; i.e., number of solutions to x^2 + y^2 = z^2 mod 2^n.at n=9A091143
• a(n) = n^2*binomial(n,2).at n=31A092364
• Smallest number beginning with 5 and having exactly n prime divisors counted with multiplicity.at n=14A106425
• S-perfect numbers.at n=18A118372
• Row sums of A128134.at n=15A128135
• a(0)=8, a(n) = 2*a(n-1) + 2^(n-1) for n > 0.at n=15A159696
• Number of parts in all palindromic compositions of n.at n=30A239632
• a(1) = 1, a(2) = 2, a(3) = 5, a(4) = 8 and a(5) = 15, a(n) = Sum_{j=1..n-1} a(j).at n=19A257548
• Non-unitary amicable numbers.at n=24A259037
• Smaller of a non-unitary amicable pair.at n=12A259038
• Decimal representation of the n-th iteration of the "Rule 91" elementary cellular automaton starting with a single ON (black) cell.at n=16A267042
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 141", based on the 5-celled von Neumann neighborhood.at n=22A286029
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 249", based on the 5-celled von Neumann neighborhood.at n=18A287140
• Nonunitary superperfect numbers: numbers k such that nusigma(nusigma(k)) = k, where nusigma(k) = sigma(k) - usigma(k) is the sum of nonunitary divisors of k (A048146).at n=28A329884
• Main diagonal of the square array A058395.at n=16A362179