21572

Appears in sequences

• Integers n > 10583 such that the 'Reverse and Add!' trajectory of n joins the trajectory of 10583.at n=18A066055
• Number of arrangements of 3 nonzero numbers x(i) in -n..n with the sum of div(x(i),x(i+1)), where div(a,b)=a/b produces the integer quotient implying a nonnegative remainder, equal to zero.at n=27A190072
• 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 147", based on the 5-celled von Neumann neighborhood.at n=14A279175
• Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.at n=8A297955
• G.f.: Sum_{n>=0} x^n * (x^n + i)^n / (1 + i*x^(n+1))^(n+1), where i^2 = -1.at n=62A323675
• Numbers that are the sum of seven fourth powers in six or more ways.at n=34A345572
• Numbers that are the sum of seven fourth powers in exactly six ways.at n=25A345828
• Least number k such that there are exactly n ways to choose a multiset consisting of a binary index of each binary index of k.at n=44A367913
• Number of distinct subsets S of [1..n] such that for all 1 <= k <= n, there exists two elements x,y in S (not necessarily distinct) such that x+y = 2k.at n=17A383968