302697

Appears in sequences

• a(n) is the total number of rows of circles of radius r packing into a circle of radius R, where r = R/2^n.at n=18A239206
• Greatest integer k such that k/2^n < sqrt(1/3).at n=19A293327
• Odd numbers k for which A003958(sigma(k)) = A003958(k), where A003958 is multiplicative with a(p^e) = (p-1)^e and sigma is the sum of divisors function.at n=6A351443