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A048721 Binary packing of Fibonacci sequence A000045. 3
0, 1, 3, 7, 23, 151, 4247, 1052823, 8590987415, 18014407100469399, 309485009839359475825250455, 11150372599265311880252868975683656578240663, 6901746346790563787434755873427398051716420852423255530846180802039959 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Prime values of a(n) begin 3,7,23,151, i.e. for n = 2, 3, 4, 5. Semiprime values of a(n) begin 4247 = 31 * 137, 1052823 = 3 * 350941, i.e. for n = 6, 7. - Jonathan Vos Post, May 09 2005

LINKS

Table of n, a(n) for n=0..12.

FORMULA

a(0) = 0, a(n) = a(n-1)+(2^(Fib(n+1)-1))

CROSSREFS

Cf. A005203, A048722, A036571.

Sequence in context: A133788 A120271 A145938 * A113824 A121883 A262264

Adjacent sequences:  A048718 A048719 A048720 * A048722 A048723 A048724

KEYWORD

nonn

AUTHOR

Antti Karttunen, 30.3.1999

STATUS

approved

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Last modified February 21 22:56 EST 2018. Contains 299427 sequences. (Running on oeis4.)