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Search: id:A089281
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A089281 Smallest prime factor of floor(pi*10^n), pi=3.14.... +0
4
3, 31, 2, 3, 5, 314159, 2, 2, 3, 3, 5, 2, 13, 163, 43, 13, 2, 317213509, 2, 2, 2, 2, 2, 2, 83, 41, 2, 3, 2, 3, 3, 5, 2, 2, 2, 2, 2, 31415926535897932384626433832795028841, 13, 59, 3, 2, 3, 3, 3, 3, 3, 31, 3, 1657, 2, 3, 2, 2, 2, 29, 13, 2, 3, 2 (list; graph; listen)
OFFSET

0,1

COMMENT

a(n)=A020639(A011545(n)).

EXAMPLE

n=10: floor(pi*10^10)=31415926535=5*7*31*28954771: a(10)=5.

CROSSREFS

Cf. A078604, A000796.

Sequence in context: A059232 A068698 A053300 this_sequence A090543 A139090 A042477

Adjacent sequences: A089278 A089279 A089280 this_sequence A089282 A089283 A089284

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 30 2003

EXTENSIONS

More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 30 2003

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.


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