A036512 Smallest square containing exactly n 5's.

25, 5625, 55225, 555025, 505575225, 525555625, 55255554225, 255555525625, 5552545555456, 555505585935556, 51560555559555025, 455516555553551556, 15455545578525555556, 55505555659555755625, 1597555555555855545225, 275555535501555955575556

Offset

1,1

Comments

a(20) > 10^28. - Giovanni Resta, Jul 27 2018

Links

Giovanni Resta, Table of n, a(n) for n = 1..19

Mathematica

a[n_] := Block[{k=1}, While[DigitCount[k^2, 10, 5] != n, k++]; k^2]; Array[a, 6] (* Giovanni Resta, Jul 27 2018 *)

Crossrefs

Cf. A048350. - Jon E. Schoenfield, Jan 24 2009

Sequence in context: A178026 A012748 A337725 * A306380 A053860 A369582

Adjacent sequences: A036509 A036510 A036511 * A036513 A036514 A036515

Keyword

nonn,base

Author

David W. Wilson

Extensions

More terms from Jon E. Schoenfield, Jan 14 2009

a(16) from Giovanni Resta, Jul 27 2018

Status

approved