29145

Appears in sequences

• Spiral sieve using Fibonacci numbers.at n=21A005624
• a(n) is the concatenation of n and 5n.at n=28A019553
• Numbers n such that sigma(2*phi(n)) = 2*sigma(n).at n=15A137733
• a(n) = (2*n^3 + 5*n^2 - 7*n)/2.at n=29A162261
• Number of (n+1) X (7+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.at n=2A250811
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.at n=38A250812
• Number of (3+1) X (n+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.at n=6A250815
• Numbers k such that k and k+1 are the product of exactly four distinct primes.at n=32A318896
• Numbers k such that k*A001414(k)+1 is the square of a prime.at n=24A343141
• E.g.f. A(x) satisfies A(x) = x * exp(A(x)) * (1 + 2*A(x)).at n=5A376123