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

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

Offset: 0

Author

Felice Russo

Keywords

• nice
• nonn
• easy
• base

Examples

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

References

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

Crossrefs

Cf. A048559, A048560, A051670.

Extensions

More terms from Patrick De Geest, Dec 15 1999