A051671 Smallest positive number whose digits concatenated with all previous terms forms a perfect square.

4, 9, 284, 61209, 14204828164, 4440027571600000000001, 7667716927194638935286982918857620344809476

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