23107

Appears in sequences

• Expansion of 1/(1-x^4-x^5-x^6-x^7-x^8-x^9).at n=40A017831
• Number of n X 2 0..3 arrays with no more than n elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.at n=4A222839
• T(n,k) is the number of n X k 0..3 arrays with no more than floor(n*k/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.at n=16A222842
• T(n,k) is the number of n X k 0..3 arrays with no more than floor(n*k/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.at n=19A222842
• T(n,k)=Number of nXk 0..3 arrays with no more than floor(nXk/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.at n=19A223041
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + 2n, where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=16A294547
• Numbers k such that phi(2k+1) = phi(2k+2).at n=15A308378
• Numbers that are the sum of eight fourth powers in exactly nine ways.at n=26A345841
• Numbers that can be represented in more than one way as p^2+p*q+q^2 with p and q primes, p<=q.at n=21A349987
• Semiprimes of the form k^2 + 3.at n=32A360740