A089289 Squarefree kernel of floor(Pi*10^n), Pi = 3.14....

3, 31, 314, 1047, 31415, 314159, 785398, 31415926, 104719755, 3141592653, 31415926535, 314159265358, 3141592653589, 31415926535897, 314159265358979, 3141592653589793, 2243994752564138, 314159265358979323

Offset

0,1

Links

Table of n, a(n) for n=0..17.

Formula

a(n) = A007947(A011545(n)).

Example

n=16: floor(Pi*10^16) = 31415926535897932 = 2^2 * 7^2 * 2381 * 57493 * 1170899: a(16) = 2 * 7 * 2381 * 57493 * 1170899 = 2243994752564138.

Crossrefs

Cf. A000796, A007947, A011545.

Sequence in context: A037785 A037589 A247351 * A011545 A011546 A361612

Adjacent sequences: A089286 A089287 A089288 * A089290 A089291 A089292

Keyword

nonn

Author

Reinhard Zumkeller, Oct 30 2003

Status

approved