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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. 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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 6 19:33 EST 2022. Contains 358648 sequences. (Running on oeis4.)