51060

Appears in sequences

• a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026648.at n=6A026974
• Golden rectangular box numbers: a(n) = n*A007067(n)*A007067(A007067(n)).at n=23A050510
• Values of m such that N = (am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,63.at n=9A065699
• Number of -2..2 arrays x(i) of n+1 elements i=1..n+1 with set{t,u,v in 0,1}((x[i+t]+x[j+u]+x[k+v])*(-1)^(t+u+v)) having two, three, four, five or six distinct values for every i,j,k<=n.at n=7A211580
• Number of (n+2) X (7+2) 0..3 arrays with every consecutive three elements in every row and column having exactly two distinct values, and in every diagonal and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=7A252694
• n such that 3 < sigma(n)/n < sigma(m)/m for all abundant numbers m<n such that 3 < sigma(m)/m.at n=7A259312
• Irregular triangle read by rows: Numbers of unbranched k-5-catafusenes.at n=58A323944
• Nonprime numbers k such that A054008(k) = A054024(k).at n=15A343242
• Members of A014574 with sum of prime factors (with multiplicity) also in A014574.at n=30A349455
• Median of twin prime pairs with n decimal digits.at n=4A387500