This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A292772 a(n) = cardinality of a certain set of natural numbers defined using A117818. 1
 1, 2, 3, 4, 6, 8, 12, 18, 25, 38, 56, 89, 138, 218, 342, 547, 882, 1429, 2299, 3705, 5961, 9615, 15524, 25057, 40442, 65247, 105412, 170224, 274963, 44156, 717551, 1159406, 1873356 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Let s(n) = A117818(n). Define sets C_n of natural numbers by C_0 = {1}; C_(n+1) = C_n union {s(x+y): x, y in C_n} for n >= 0. Then a(n) = |C_n|. REFERENCES Mihai Caragiu, P. A. Vicol. M. Kaki, On Conway's subprime function, a covering of N and an unexpected appearance of the golden ratio, Fib. Q., to appear, 2017. LINKS CROSSREFS Cf. A117818. Sequence in context: A319054 A074964 A017822 * A179042 A222786 A156082 Adjacent sequences:  A292769 A292770 A292771 * A292773 A292774 A292775 KEYWORD nonn,more AUTHOR N. J. A. Sloane, Sep 29 2017 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 27 06:24 EDT 2019. Contains 323599 sequences. (Running on oeis4.)