A089281 - OEIS

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A089281

Smallest prime factor of floor(pi*10^n), pi=3.14....

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; refs; listen; history; internal format)

	OFFSET	`0,1`
	COMMENTS	`a(n)=A020639(A011545(n)).`
	EXAMPLE	`n=10: floor(pi10^10)=31415926535=573128954771: a(10)=5.`
	CROSSREFS	`Cf. A078604, A000796.` `Sequence in context: A059232 A068698 A053300 * A090543 A139090 A042477` `Adjacent sequences: A089278 A089279 A089280 * 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 February 17 02:08 EST 2012. Contains 205978 sequences.