25503

Appears in sequences

• Fibonacci numbers written in base 7.at n=20A004690
• a(n) = Sum_{k=1..n} lcm(k,n)/gcd(k,n).at n=44A056789
• Construct sequences P,Q,R by the rules: Q = first differences of P, R = second differences of P, P starts with 1,3,9, Q starts with 2,6, R starts with 4; at each stage the smallest number not yet present in P,Q,R is appended to R. Sequence gives P.at n=47A225385
• Number of incongruent n-sided periodic Reinhardt polygons.at n=62A373694