1024128

Appears in sequences

• G.f.: square root of weight enumerator of [128,8,64] Reed-Muller code RM(1,7).at n=3A110828
• a(1) = 6; for n>1, a(n) = prime(n)*(prime(n)^2 - 1)/2.at n=30A117762
• Half of product of three numbers: n-th prime, previous and following number.at n=30A127918
• Consider numbers m,n such that UnitaryPhi(m)=UnitaryPhi(n)=3*(m*n)^(1/2)/4, m <= n; sequence gives values of n.at n=7A143649
• Numbers m,n such that UnitaryPhi(n)=UnitaryPhi(m)=3/4*(m*n)^(1/2), m<=n; sequence gives values of m.at n=7A143650
• Primitive non-solvable numbers: orders of non-solvable groups such that all groups with order a proper divisor of that order are solvable.at n=21A216480
• Orders of simple groups PSL(2,K) with exactly 4 prime divisors.at n=17A364004