20030

Appears in sequences

• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite EPI = Epistilbite Ca3[Al6Si18O48].16H2O starting with a T1 atom.at n=13A019119
• Multiples of 5 with digit sum 5.at n=37A069540
• Smallest composite number m such that m and the greatest prime divisor of m begin with n.at n=19A197816
• a(n) = number of primes less than the square root of the (2^n)-th prime.at n=31A249058
• Numbers k such that 6*10^k + 91 is prime.at n=28A265938
• Sum of the sixth largest parts in the partitions of n into 8 parts.at n=46A308992
• Sum of the eighth largest parts in the partitions of n into 9 parts.at n=48A326466
• a(n) is the number of possible values of numbers of divisors of numbers k with Omega(k) = n.at n=47A355027
• a(n) = [(x*y)^n] Product_{k>=1} (1 + x^k + y^k)^n.at n=5A382950