A140270 A number n is included if gcd((largest divisor of n that is < sqrt(n)), (smallest divisor of n that is > sqrt(n))) > 1.

8, 16, 18, 24, 27, 32, 48, 50, 54, 60, 64, 75, 80, 81, 96, 98, 100, 108, 112, 120, 125, 128, 135, 140, 147, 150, 160, 162, 168, 180, 189, 192, 196, 200, 216, 224, 242, 243, 245, 250, 252, 256, 264, 270, 280, 288, 294, 300, 308, 315, 320, 324, 338, 343, 352, 360

Offset

1,1

Comments

This is the same a sequence A140269, but without some square terms.

Links

Table of n, a(n) for n=1..56.

Example

The divisors of 48 are 1,2,3,4,6,8,12,16,24,48. The middle two of these divisors are 6 and 8, which are not coprime. So 48 is included in this sequence.

Crossrefs

Cf. A060775, A140271, A140269.

Sequence in context: A338930 A357002 A356441 * A257225 A092456 A232724

Adjacent sequences: A140267 A140268 A140269 * A140271 A140272 A140273

Keyword

nonn

Author

Leroy Quet, May 16 2008

Extensions

More terms from Max Alekseyev, May 03 2009

Status

approved