A085913 Group the natural numbers such that the product of the terms of the n-th group is divisible by n!. (1),(2),(3,4),(5,6,7,8),(9,10,11,12),(13,14,15,16,17,18),(19,20,21,22,23,24),... Sequence contains the first term of every group.

1, 2, 3, 5, 9, 13, 19, 25, 33, 41, 51, 61, 73, 85, 99, 113, 129, 145, 163, 181, 201, 221, 243, 265, 289, 313, 339, 365, 393, 421, 451, 481, 513, 545, 579, 613, 649, 685, 723, 761, 801, 841, 883, 925, 969, 1013, 1059, 1105, 1153, 1201, 1251, 1301, 1353, 1405

Offset

1,2

Comments

Differs from A099392 at n = 61.

Links

Table of n, a(n) for n=1..54.

Mathematica

i = 1; Table[p = i; s = i; While[!Divisible[p *= i++, n!]]; s, {n, 1, 54}] (* Jon Maiga, Nov 28 2018 *)

Crossrefs

Cf. A085912, A085914, A085915.

Sequence in context: A064386 A049715 A076095 * A060482 A018138 A336631

Adjacent sequences: A085910 A085911 A085912 * A085914 A085915 A085916

Keyword

nonn

Author

Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jul 10 2003

Extensions

More terms from Ray Chandler, Sep 15 2003

Status

approved