252271

Appears in sequences

• Pairs (x, y), x < y, of f-amicable numbers where f(k) = floor(|k*sin(k)|) sorted by increasing y, then increasing x; f-amicable numbers are defined in A066511.at n=21A066573
• Boustrophedon transform of odd primes, cf. A065091.at n=9A230953