25556

Appears in sequences

• a(n)= Sum_{j=0..floor(n/2)} A073145(2*j + q), where q = 2*(n/2 - floor(n/2)).at n=35A074585
• Records in A068189 (smallest number k such that n = product of nonzero digits of k, or 0 if no such k exists).at n=46A096867
• a(0) = 0, a(1) = a(2) = 1, a(3) = 2, a(4) = 4, for n>3: a(n+1) = SORT[ a(n) + a(n-1) + a(n-2) + a(n-3) + a(n-4)], where SORT places digits in ascending order and deletes 0's.at n=44A108565
• Number of numbers up to 10^n which are products of three primes.at n=5A109251
• Triangle read by rows: T(k,n) is number of numbers <= 10^n that are products of k primes.at n=33A126280
• Number of nX6 0..1 arrays with no element less than a strict majority of its horizontal, diagonal and antidiagonal neighbors.at n=2A231521
• T(n,k)=Number of nXk 0..1 arrays with no element less than a strict majority of its horizontal, diagonal and antidiagonal neighbors.at n=30A231523
• Number of 3Xn 0..1 arrays with no element less than a strict majority of its horizontal, diagonal and antidiagonal neighbors.at n=5A231525
• Integers n where n^3 + (n+1)^3 is a Taxicab number A001235.at n=16A259836
• Number of integers in n-th generation of tree T(3/4) defined in Comments.at n=50A274146
• Expansion of 1/(1 - Sum_{p prime, k>=2} x^(p^k)).at n=66A280605
• Number of compositions (ordered partitions) of n into odd primes (including 1).at n=23A309676
• Table read by downward antidiagonals: T(n,k) is the number of tilings of the n X k torus up to horizontal and vertical reflections by a tile that is fixed under horizontal reflections but not vertical reflections.at n=38A368302