26781

Appears in sequences

• Which composite number is the product of first n primes (the n-th primorial number)?: a(n) = k such that A002808(k) = A002110(n), or 0 if A002110(n) is not composite.at n=5A065898
• Numbers n such that n*359# +-1 are twin primes, where 359# = 72nd primorial (A002110(72)).at n=24A087907
• Triangle read by rows, formed from product of Aitken's (or Bell's) triangle (A011971) and Pascal's triangle (A007318).at n=24A095675
• Composite squarefree numbers n such that p(i)+6 divides n-6, where p(i) are the prime factors of n.at n=1A225716
• Number of squarefree parts in the partitions of n into 7 parts.at n=45A309459
• Products p*q*r of three distinct primes such that (p*q) mod r, (p*r) mod q and (q*r) mod p are all prime.at n=30A338704
• a(n) is the least k such that A345468(k) = 2*n-1.at n=41A345469
• Centered pentagonal numbers which are products of three distinct primes.at n=16A364610
• Least composite squarefree numbers k > n such that p + n divides k - n, for each prime p dividing k.at n=5A382484