A078216 a(n) = A078215(n)^(1/2).

1, 5, 55, 220, 2420, 79860, 878460, 28989180, 956642940, 32525859960, 1073353378680, 35420661496440, 1168881829382520, 38573100369623160, 1234339211827941120, 40733193990322056960, 4154785787012849809920

Offset

1,2

Links

Table of n, a(n) for n=1..17.

Prog

(PARI) {print1(a=1, ", "); for(n=2, 17, k=floor(log(a)/log(10))+1; s=n; t=s+1; m=floor(log(s)/log(10))+1; d=k-m; s=s*10^d; t=t*10^d; b=1; while(b>0, q=floor(s/a); while(b>0&&(p=q*a)<t, if(p>=s&&issquare(p), print1(sqrtint(p), ", "); b=0, q++)); s=10*s; t=10*t); a=p)}

Crossrefs

Cf. A078215, A078815.

Sequence in context: A292455 A292735 A057722 * A014700 A103326 A060558

Adjacent sequences: A078213 A078214 A078215 * A078217 A078218 A078219

Keyword

base,nonn

Author

Amarnath Murthy, Nov 22 2002

Extensions

Edited and extended by Klaus Brockhaus, Dec 06 2002

Status

approved