23815

Appears in sequences

• Total number of even parts in all partitions of n.at n=30A066898
• a(n) = 54*n^2 + 1.at n=21A158646
• Integers of the form 4n+3 for which Sum_{i=1..u} J(i,4n+3) obtains value zero exactly 7 times, when u ranges from 1 to (4n+3). Here J(i,k) is the Jacobi symbol.at n=31A166057
• Number of (n+1)X3 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order.at n=2A203872
• Number of (n+1)X4 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order.at n=1A203873
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order.at n=7A203878
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order.at n=8A203878
• Number of partitions of n such that (greatest part) + (least part) > number of parts.at n=40A237870
• Numbers n such that n^2048 + (n+1)^2048 is prime.at n=24A274235
• Squarefree composite numbers n such that n*sigma(n) is of the form k*(k+1).at n=5A291192
• Numbers m such that m^2+1 is semiprime with (m-1)^2+1 and (m+1)^2+1 primes.at n=41A321985
• Composite numbers k such that k-1 divides 2^k-2.at n=25A330382
• a(n) is the smallest lucky number L(k) such that the n-th difference of (L(k), ..., L(k+n)) is zero, where L is A000959; a(n) = 0 if no such number exists.at n=10A350002
• Upper (1/2,1/3) midsequence of (n^2) and (n^3); see Comments.at n=41A389583