258049

Appears in sequences

• a(n) = 8^n - 4^n + 1.at n=6A155629
• a(n) = 63*2^(n+1) + 1.at n=11A196657
• Take the first n digits on the binary Champernowne string (cf. A030302); a(n) gives the starting index of the second occurrence of this n-digit string within the binary Champernowne string.at n=18A351753
• Take the first n digits on the binary Champernowne string (cf. A030302); a(n) gives the starting index of the second occurrence of this n-digit string within the binary Champernowne string.at n=19A351753