A098162 a(n+1) = smallest number greater than a(n) having with a(n) a common divisor which is used before as such a common divisor at most once; a(1) = 1.

1, 2, 3, 6, 8, 10, 15, 18, 24, 28, 32, 40, 45, 54, 60, 70, 77, 84, 96, 104, 117, 126, 140, 150, 165, 176, 187, 204, 216, 234, 247, 266, 280, 300, 315, 336, 352, 368, 391, 408, 432, 450, 475, 494, 520, 540, 567, 588, 616, 638, 660, 690, 713, 744, 768, 800, 825

Offset

1,2

Comments

a(n) - a(n-1) = GCD(a(n),a(n-1) for n>1.

Links

Table of n, a(n) for n=1..57.

Crossrefs

Cf. A098163.

Sequence in context: A179785 A246445 A082667 * A076627 A020489 A002240

Adjacent sequences: A098159 A098160 A098161 * A098163 A098164 A098165

Keyword

nonn

Author

Reinhard Zumkeller, Aug 30 2004

Status

approved