63349

Appears in sequences

• a(n) = floor(7^7/n).at n=12A057069
• Numbers n such that phi(phi(n)) + sigma(sigma(n)) - phi(sigma(n)) - sigma(phi(n)) = phi(n).at n=6A066945
• Expansion of (1-2x)^2/((1-3x)(1-4x)).at n=8A093834
• Monotonic ordering of nonnegative differences 4^i-3^j, for 40>=i>=0, j>=0.at n=42A192148
• Number of n-bit numbers that can be written as the concatenation of 0 or more prime numbers (everything written in base 2).at n=18A246807
• Positive numbers k such that -k, -(k + 1), -(k + 2), and -(k + 3) are 4 consecutive negative negabinary-Niven numbers (A331728).at n=23A331825