A247885 Smallest square that remains a square when prefixed with n.

225, 25, 4225, 9, 625, 4, 225, 1, 3025, 5625, 9025, 1, 225, 4, 625, 9, 64, 49, 36, 25, 16, 5625, 87025, 8850625, 889914313729282379150390625, 9669767640625, 225, 9, 16, 25, 36, 4, 64, 81, 15625, 1, 1456358697509765625, 142604475904693603515625, 1050625

Offset: 1

Author

Derek Orr, Sep 25 2014

Keywords

• nonn
• base
• look

Links

• Hiroaki Yamanouchi, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A167035, A167036, A167037, A167038, A167039, A167041, A167042, A167043, A167044.

Programs

PARI

a(n)=k=1;while(!issquare(eval(concat(Str(n),Str(k^2)))),k++);k^2
vector(24,n,a(n))

Extensions

a(25)-a(39) from Hiroaki Yamanouchi, Sep 26 2014