A108690 Square roots of the terms in A080160.

1, 2, 3, 4, 5, 6, 7, 8, 9, 18, 21, 24, 27, 30, 33, 36, 45, 48, 51, 54, 57, 60, 63, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 99, 102, 105, 108, 111, 114, 117, 126, 129, 132, 135, 138, 141, 144, 153, 154, 155, 156, 157, 158, 159, 160

Offset: 1

Author

N. J. A. Sloane, Jun 19 2005

Keywords

• nonn
• base

Crossrefs

Cf. A080160.

Programs

Maple

b:=n->sum(convert(((10^(n+1)-1)/9)^2,base,10)[j],j=1..2*n+1): a:=proc(n) if type(sqrt(b(n)), integer)=true then sqrt(b(n)) else fi end:seq(a(n),n=0..2000); # Emeric Deutsch, Jun 19 2005

Extensions

More terms from Emeric Deutsch, Jun 19 2005