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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 Cf. A000045, A005203, A048722, A036571. Sequence in context: A120271 A145938 A329875 * A113824 A121883 A262264 Adjacent sequences:  A048718 A048719 A048720 * A048722 A048723 A048724 KEYWORD nonn AUTHOR Antti Karttunen, Mar 30 1999 STATUS approved

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Last modified July 24 20:26 EDT 2021. Contains 346273 sequences. (Running on oeis4.)