180180

Appears in sequences

• Numbers N in A002809 such that there is rho > 0 such that for all A > 0, A008475(A)-A008475(N) >= rho*log(A/N).at n=6A002497
• Increasing values of A000793 (largest order of permutation of n elements).at n=30A002809
• Smaller of unitary amicable pair.at n=8A002952
• Maximal period of an n-stage shift register.at n=20A005417
• Numbers k such that sigma(k)/phi(k) sets a new record.at n=25A018894
• Numbers k such that sigma(k) >= 4*k.at n=29A023198
• LCM of {C(0,0), C(1,0), ..., C(n, floor(n/2))}.at n=13A025552
• Least common multiple (or LCM) of first n positive triangular numbers (A000217).at n=12A025555
• Least common multiple (or LCM) of first n positive triangular numbers (A000217).at n=11A025555
• Least common multiple (or LCM) of first n positive triangular numbers (A000217).at n=13A025555
• a(n) = LCM{1, C(n-1,1), C(n-2,2), ..., C(n-[ n/2 ],[ n/2 ])}.at n=13A025560
• a(n) = LCM{1, C(n-1,1), C(n-2,2), ..., C(n-[ n/2 ],[ n/2 ])}.at n=15A025560
• a(n) = 5*(n+1)*binomial(n+3,6).at n=8A027791
• a(n) = 15*(n+1)*binomial(n+3,10).at n=4A027795
• a(n) = 14*(n+1)*binomial(n+4,8).at n=5A027804
• Denominator of (1/n)*Sum_{k=0..n-1} 1/binomial(n-1,k) for n>0 else 1.at n=14A046879
• a(n) = binomial(2n,n)*n*(2n+1)/2.at n=7A051133
• Leading least prime signatures: a(n) is in A025487 but a(n)/2 is not.at n=29A056153
• Maximal order of element of alternating group A_{2n}.at n=27A057742
• Maximal order of element of alternating group A_{2n}.at n=26A057742