id:A090226 - OEIS Search Results

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Least k such that prime(k) has n digits. Index of least n-digit prime.

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1, 5, 26, 169, 1230, 9593, 78499, 664580, 5761456, 50847535, 455052512, 4118054814, 37607912019, 346065536840, 3204941750803, 29844570422670, 279238341033926, 2623557157654234, 24739954287740861, 234057667276344608 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`C. Caldwell's Prime Pages, A Table of values of pi(x).` `X. Gourdon, A Table of values of pi(x).`
	FORMULA	`a(1)=1; a(n)=pi(10^(n-1))+1 for n>1 where pi(x) is the number of primes less than x - C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 26 2004`
	CROSSREFS	`Cf. A003617 (values of prime(k)).` `Sequence in context: A001705 A081047 A057793 this_sequence A094422 A121750 A007286` `Adjacent sequences: A090223 A090224 A090225 this_sequence A090227 A090228 A090229`
	KEYWORD	`base,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 25 2003`
	EXTENSIONS	`Corrected and extended by C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 26 2004`

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Last modified September 8 08:06 EDT 2008. Contains 143486 sequences.

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