43910

Appears in sequences

• Engel expansion of e^Pi = 23.14069... .at n=33A059196
• Number of isomorphism classes of non-associative commutative closed binary operations on a set of order n.at n=4A079196
• Numbers n such that n^9+9 and n^9-9 are prime.at n=34A239505
• Number of n X 2 0..3 arrays with no element equal to two plus the sum of elements to its left or two plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.at n=15A240333
• Solutions of the equation (n+2)' = (n+1)' + n', where n' is the arithmetic derivative of n.at n=3A241214
• Number T(n,k) of words on {1,1,2,2,...,n,n} with longest increasing subsequence of length k; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=18A267480
• Expansion of a q-series used by Ramanujan in his Lost Notebook.at n=35A279715
• Number of positive solutions to (x_1)^2 + (x_2)^2 + ... + (x_9)^2 <= n^2.at n=4A341428