a(n) = product of the "isolated divisors" of n. A divisor k of n is isolated if neither k-1 nor k+1 divides n.

A134338

a(n) = product of the "isolated divisors" of n. A divisor k of n is isolated if neither k-1 nor k+1 divides n.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =32a(8) =27a(9) =50a(10) =11a(11) =72a(12) =13a(13) =98a(14) =225a(15) =512a(16) =17a(17) =972a(18) =19a(19) =200a(20) =441a(21) =242a(22) =23a(23) =13824a(24) =125a(25) =338a(26) =729a(27) =10976a(28) =29a(29) =4500

External references