570570

Appears in sequences

• Number of genus 2 rooted maps with 1 face with n vertices.at n=4A006298
• Triangle read by rows giving number of ways to glue sides of a 2n-gon so as to produce a surface of genus g.at n=22A035309
• Triangle read by rows in which row n contains first n numbers with exactly n distinct prime factors.at n=22A048692
• Triangle read by rows: T(n,k) = A002110(n)/prime(n+1-k), k = 1..n.at n=29A077011
• Integers n for which the ratio phi(n)/pi(n) is smaller than for any subsequent n. Here phi(n) is Euler's totient function and pi(n) is the number of primes that are at most n.at n=30A080289
• First occurrence (*2) of n in A088627 - or - least number that yields n different primes if you factorize it in all possible ways in two factors and add these factors.at n=36A091350
• a(n) = A019565(n-th prime).at n=42A109163
• Triangle T(n,k) read by rows: T(n,0) = A002110(n) and T(n,k) = A002110(n)/prime(k) for 1<=k<=n.at n=43A121281
• Products of 7 distinct primes (squarefree 7-almost primes).at n=1A123321
• Table read by ascending antidiagonals: n-th row of table consists of the positive integers divisible by exactly n distinct primes.at n=29A125666
• Coefficients in the expansion of C^2/B^10, in Watson's notation of page 106.at n=9A160458
• Numbers that are divisible by exactly 7 distinct primes.at n=1A176655
• Partial products of A185956.at n=6A185693
• Number of squarefree words of length 5 in an (n+1)-ary alphabet.at n=13A214944
• Largest number that can be encoded as Product_{i:lambda} prime(i) for a partition lambda of n into distinct parts.at n=29A246868
• Sum over all partitions lambda of n into 7 distinct parts of Product_{i:lambda} prime(i).at n=1A258362
• Triangle in which n-th row contains all possible products of n-1 of the first n primes in descending order.at n=34A258566
• "Near Primorial" numbers.at n=20A259629
• Triangle read by rows: T(n,f) is the number of rooted maps with n edges and f faces on an orientable surface of genus 2.at n=14A269922
• Triangle read by rows: T(n,f) is the number of rooted maps with n edges and f faces on an orientable surface of genus 2.at n=10A269922