123197

Appears in sequences

• Number of permutations of length n which avoid the patterns 1423, 1432, 3241.at n=10A116790
• Product of the n-th cousin prime pair.at n=19A143206
• Numbers k such that exactly one d, 2 <= d <= k/2, exists which divides binomial(k-d-1, d-1) and is not coprime to k.at n=28A178071
• Increasing a(n)is the smallest number of the form p^a*q^b, where a,b are positive integers and p < q are odd primes such that max( p^a, q^b)/min( p^a, q^b) <= 1 + 2/prime(n).at n=37A229108
• Parent nodes of nonzero terms of A262509: a(n) = A049820(A262509(n)).at n=32A262510
• Sequence of pairwise relatively prime numbers of class P_3 (see comment).at n=35A275246
• Interprimes that are products of two successive primes.at n=5A354682