660660

Appears in sequences

• Numbers with exactly 6 distinct prime divisors {2,3,5,7,11,13}.at n=19A147573
• Number of 2 X 2 matrices having all terms in {-n,...,0,..,n} and positive odd determinant.at n=20A211158
• Average of twin prime pairs n having their decimal expansion of the form abcabc or abcabc0 such that n contains three twin primes as divisors.at n=7A235716
• Numbers n such that A244112(n) | n.at n=10A278440
• Check the abundance of a number and iterate the test replacing at every step the sum of the divisors of the previous number. Sequence lists the least numbers whose abundances last n steps.at n=24A286659
• a(n) = ((n + 1)/2)*(n + 2)*Pochhammer(n, 5) / 4!.at n=10A293476
• a(n) is the least k > 0 such that 1+k, 1+2*k, ..., 1+n*k are pairwise coprime.at n=29A339743
• Distinct values in A339743, in order of appearance.at n=11A339759
• a(n) = (1000^n - 1)*(220/333).at n=1A342994
• a(n) is the smallest number whose divisors include exactly n that can be written in the form m + reverse(m), for some m (A067030).at n=46A358513