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A051671 Smallest positive number whose digits concatenated with all previous terms forms a perfect square. 8
4, 9, 284, 61209, 14204828164, 4440027571600000000001, 7667716927194638935286982918857620344809476 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

A. Murthy, Smar. Notions J. Vol. 11 N. 1-2-3 Spring 2000.

LINKS

Table of n, a(n) for n=0..6.

EXAMPLE

284 belongs to the sequence because 49284=222^2.

CROSSREFS

Cf. A048559, A048560, A051670.

Sequence in context: A175700 A035126 A178454 * A109103 A029734 A085065

Adjacent sequences:  A051668 A051669 A051670 * A051672 A051673 A051674

KEYWORD

nice,nonn,easy,base

AUTHOR

Felice Russo

EXTENSIONS

More terms from Patrick De Geest, Dec 15 1999

STATUS

approved

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Last modified February 22 23:14 EST 2020. Contains 332157 sequences. (Running on oeis4.)