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A061111 a(1) = 1; a(n) = smallest number such that the concatenation a(1).0^*.a(2).0^*....0^*.a(n) is a perfect cube (where any number of 0's can be inserted between the terms). 0
1, 25, 9712, 4500526591296 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The implication is that 10...01, 10...02, 10...03, ..., 10...024 are never cubes for any number of internal zeros, while 125 IS a cube, so a(2) = 25. - N. J. A. Sloane, Jul 21 2001

REFERENCES

Amarnath Murthy, Exploring some new ideas on Smarandache type sets, functions and sequences, Smarandache Notions Journal Vol. 11, No. 1-2-3, Spring 2000.

LINKS

Table of n, a(n) for n=0..3.

EXAMPLE

a(1) = 1, a(1)a(2) = 125 = 5^3, a(1)a(2)a(3) = 1259712 = 108^3, a(1)a(2)a(3)0a(4) = 5012916^3.

CROSSREFS

Cf. A061109, A051671, A061110.

Sequence in context: A306380 A053860 A091744 * A238564 A195682 A082211

Adjacent sequences:  A061108 A061109 A061110 * A061112 A061113 A061114

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Apr 20 2001

STATUS

approved

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Last modified April 18 02:38 EDT 2021. Contains 343072 sequences. (Running on oeis4.)