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A095252

a(n) = floor(sqrt{concatenation n,(n-1),...,3,2,1}).

1, 4, 17, 65, 233, 808, 2766, 9362, 31426, 104822, 1054033, 11005043, 114547418, 1188747707, 12305003905, 127088210000, 1310019623181, 13480213329659, 138498072735374, 1420979139942389, 14560878466498901, 149036972532711329, 1523880579042109897

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OFFSET

1,2

COMMENTS

a(n) = floor(sqrt(A000422(n))). - Stefan Steinerberger, May 05 2007

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

a(4) = floor(sqrt(4321)) = 65.

MAPLE

a:= n-> floor(sqrt(parse(cat((n-i)$i=0..n-1)))):

seq(a(n), n=1..30); # Alois P. Heinz, Aug 26 2015

MATHEMATICA

Table[Floor[Sqrt[FromDigits[Flatten[Table[IntegerDigits[i], {i, n, 1, -1}]]]]], {n, 1, 25}] (* Stefan Steinerberger, May 05 2007 *)

Table[Floor[Sqrt[FromDigits[Flatten[IntegerDigits/@Range[n, 1, -1]]]]], {n, 25}] (* Harvey P. Dale, Jul 22 2024 *)

CROSSREFS

Cf. A068995.

Sequence in context: A119916 A209375 A005784 * A181410 A102207 A334827

Adjacent sequences: A095249 A095250 A095251 * A095253 A095254 A095255

KEYWORD

base,easy,nonn,less

AUTHOR

Amarnath Murthy, Jun 17 2004

EXTENSIONS

More terms from Stefan Steinerberger, May 05 2007

STATUS

approved

URL: https://oeis.org/A095252

⇱ A095252 - OEIS