66237

Appears in sequences

• Number of strings of n numbers x(i) in -2..2 with sums of x(i) and of x(i)*x(i+1) both zero.at n=9A183937
• Numbers k such that (77*10^k - 257)/9 is prime.at n=21A293277
• The number of binary self numbers not exceeding 2^n.at n=18A386569