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A011777 a(n) = least k>1 such that k^n divides k!. 4
2, 6, 15, 18, 12, 32, 24, 36, 40, 45, 48, 100, 84, 60, 154, 165, 72, 96, 80, 126, 90, 135, 286, 200, 312, 264, 168, 120, 297, 189, 160, 330, 544, 210, 144, 224, 300, 385, 396, 324, 252, 680, 350, 180, 280, 748, 572, 486, 400, 405, 315, 528, 320, 336, 450, 512, 288, 240, 715 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

For n >= 2, least k such that A011776(k)=n.

REFERENCES

Ivan Niven, Herbert S. Zuckerman and Hugh L. Montgomery, An Introduction to the Theory Of Numbers, Fifth Edition, John Wiley and Sons, Inc., NY 1991.

J. Roberts, Lure of the Integers, Math. Assoc. America, 1992, p. 251.

LINKS

T. D. Noe, Table of n, a(n) for n=1..345

Index entries for sequences related to factorial numbers

CROSSREFS

See A133481 for a better version. Cf. A011776, A011778.

Sequence in context: A119416 A134891 A020947 * A324176 A294942 A227307

Adjacent sequences:  A011774 A011775 A011776 * A011778 A011779 A011780

KEYWORD

nonn,easy

AUTHOR

Robert G. Wilson v

STATUS

approved

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Last modified June 17 19:10 EDT 2019. Contains 324198 sequences. (Running on oeis4.)