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

1,2

Links

Table of n, a(n) for n=1..64.

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

Crossrefs

Cf. A080160.

Sequence in context: A032888 A023791 A067043 * A032944 A273736 A048409

Adjacent sequences: A108687 A108688 A108689 * A108691 A108692 A108693

Keyword

nonn,base

Author

N. J. A. Sloane, Jun 19 2005

Extensions

More terms from Emeric Deutsch, Jun 19 2005

Status

approved