A090080 - OEIS

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A090080

In binary expansion of n-th prime: reduce contiguous blocks of 0's to 0 and contiguous blocks of 1's to 1.

2, 1, 5, 1, 5, 5, 5, 5, 5, 5, 1, 21, 21, 21, 5, 21, 5, 5, 5, 5, 21, 5, 21, 21, 5, 21, 5, 21, 21, 5, 1, 5, 21, 21, 85, 21, 21, 21, 21, 85, 21, 85, 5, 5, 21, 5, 21, 5, 5, 21, 21, 5, 5, 5, 5, 5, 21, 5, 85, 21, 21, 85, 21, 21, 21, 21, 85, 85, 85, 85, 21, 21, 21, 85, 21, 5, 21, 21, 21 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`a(n) = A090079(A000040(n)).`
	EXAMPLE	`A000040(25)=97 -> '1100001' -> [11][0000][1] -> [1][0][1] ->` `'101' -> 5=a(25).`
	CROSSREFS	`Cf. A004676.` `Sequence in context: A069359 A014652 A060448 * A151737 A014650 A014648` `Adjacent sequences: A090077 A090078 A090079 * A090081 A090082 A090083`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 20 2003`

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Last modified February 16 07:10 EST 2012. Contains 205874 sequences.