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A000093 a(n) = floor(n^(3/2)).
(Formerly M1344 N0515)
38
0, 1, 2, 5, 8, 11, 14, 18, 22, 27, 31, 36, 41, 46, 52, 58, 64, 70, 76, 82, 89, 96, 103, 110, 117, 125, 132, 140, 148, 156, 164, 172, 181, 189, 198, 207, 216, 225, 234, 243, 252, 262, 272, 281, 291, 301, 311, 322, 332, 343, 353, 364, 374, 385, 396, 407, 419, 430 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

B. K. Agarwala and F. C. Auluck, Statistical mechanics and partitions into non-integral powers of integers, Proc. Camb. Phil. Soc., 47 (1951), 207-216.

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Christian G. Bower, Table of n, a(n) for n=0..500

B. K. Agarwala and F. C. Auluck, Statistical mechanics and partitions into non-integral powers of integers, Proc. Camb. Phil. Soc., 47 (1951), 207-216. [Annotated scanned copy]

FORMULA

a(n) = A077121(n) - 1. [Reinhard Zumkeller, Oct 31 2009]

a(n) = floor(n*sqrt(n)). [Arkadiusz Wesolowski, Jun 01 2011]

a(n) = A000196(A000578(n)) = A074704(n)+n*A000196(n). [Reinhard Zumkeller, Jun 27 2011]

MAPLE

Digits := 100: A000093 := n->floor(evalf(n^(3/2)));

MATHEMATICA

Table[ Floor[ Sqrt[n^3]], {n, 0, 60}]

PROG

(PARI) a(n)=if(n<0, 0, sqrtint(n^3))

(Haskell)

a000093 = a000196 . a000578  -- Reinhard Zumkeller, Jul 11 2014

CROSSREFS

Integer part of square root of n^k: A000196 (k=1), this sequence (k=3), A155013 (k=5), A155014 (k=7), A155015 (k=11), A155016 (k=13), A155018 (k=15), A155019 (k=17).

Cf. A002821.

Cf. A185549.

Sequence in context: A192585 A172262 A163516 * A070214 A031210 A287960

Adjacent sequences:  A000090 A000091 A000092 * A000094 A000095 A000096

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from James A. Sellers, May 04 2000

STATUS

approved

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Last modified October 22 02:06 EDT 2017. Contains 293756 sequences.