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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. 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; text; internal format)
OFFSET

1,1

COMMENTS

a(n) = A090079(A000040(n)).

LINKS

Table of n, a(n) for n=1..79.

EXAMPLE

A000040(25)=97 -> '1100001' -> [11][0000][1] -> [1][0][1] ->

'101' -> 5=a(25).

CROSSREFS

Cf. A004676.

Sequence in context: A318320 A014652 A060448 * A151737 A211361 A249548

Adjacent sequences:  A090077 A090078 A090079 * A090081 A090082 A090083

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller, Nov 20 2003

STATUS

approved

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Last modified August 10 19:52 EDT 2020. Contains 336381 sequences. (Running on oeis4.)