21434

Appears in sequences

• Number of rooted compound windmills (mobiles) of n nodes.at n=12A032200
• Numbers k such that (k / sum of digits of k) and (k+1 / sum of digits of k+1) are both prime.at n=21A085775
• Numbers k such that the first 9 decimal digits of the k-th Fibonacci number is 1-9 pandigital.at n=11A112516
• Numbers k such that the number of prime divisors of the k-th Catalan number (counted with multiplicity) divides k.at n=34A121612
• Numbers k such that 6*prime(k) -+ {1,5} are all prime.at n=29A174393
• Number of partitions of n where the difference between consecutive parts is at most 5.at n=40A238865
• Number of strong (=generic) guillotine rectangulations with n rectangles.at n=7A375913