68906

Appears in sequences

• Number of primes with n digits.at n=6A006879
• Numbers of the form 12*k + 2 with nonempty inverse totient set.at n=16A063668
• Numbers n such that there are integers a < b with a^2+(a+1)^2+...+(n-1)^2 = (n+1)^2+(n+2)^2+...+b^2.at n=12A094552
• Squarefree oblong (pronic) numbers having an odd number of prime factors.at n=37A098827
• a(n) = (7*n + 3)*(7*n + 4).at n=37A177071
• Number of (n+1)X(2+1) 0..2 arrays colored with the maximum plus the lower median of every 2X2 subblock.at n=3A236713
• Number of (n+1) X (4+1) 0..2 arrays colored with the maximum plus the lower median of every 2 X 2 subblock.at n=1A236715
• T(n,k) = Number of (n+1) X (k+1) 0..2 arrays colored with the maximum plus the lower median of every 2 X 2 subblock.at n=11A236719
• T(n,k) = Number of (n+1) X (k+1) 0..2 arrays colored with the maximum plus the lower median of every 2 X 2 subblock.at n=13A236719
• Numbers n such that 2 * (1^n + 2^n + 3^n + ... + n^n) is not 0 (mod n), but 2 * (1^d + 2^d + 3^d + ... + d^d) is 0 (mod d) for each other d | n.at n=27A280187
• Numbers that are the sum of six fifth powers in two or more ways.at n=34A345507
• Primitive terms of A108569.at n=34A346277
• Numbers that are the sum of six fifth powers in exactly two ways.at n=34A346357