

A085913


Group the natural numbers such that the product of the terms of the nth 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.


4



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
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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



