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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
FORMULA
a(0) = 0, a(n) = a(n-1)+(2^(Fib(n+1)-1)).
CROSSREFS
Sequence in context: A120271 A145938 A329875 * A113824 A121883 A262264
KEYWORD
nonn
AUTHOR
Antti Karttunen, Mar 30 1999
STATUS
approved

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Last modified March 29 01:36 EDT 2024. Contains 371264 sequences. (Running on oeis4.)