27667

Appears in sequences

• 5x - 1 sequence starting at 19 (a(n+1) = a(n)/2 if a(n) is even, or 5*a(n)-1 if a(n) is odd).at n=26A037238
• Number of compositions (ordered partitions) of n into distinct squarefree parts.at n=38A331846
• One-quarter of the number of regions in the central square of an equal-armed cross with arms of length n (as in A331456).at n=12A337641
• Semiprimes k such that k is congruent to 3 modulo k's index in the sequence of semiprimes.at n=7A357807