The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A145819 Union of A145812 and A145818 with double repetition of 1, so that a(1)=1, a(2)=1 4
 1, 1, 3, 5, 9, 11, 17, 21, 33, 35, 41, 43, 65, 69, 81, 85, 129, 131, 137, 139, 161, 163, 169, 171, 257, 261, 273, 277, 321, 325, 337, 341 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Theorem. For every even integer m there exists a representation of the form m=a(r)+a(s). If A(x) is the counting function of a(n)<=x, then A(x)=O(sqrt(x))and Omega(sqrt(x)). Conjecture. The sequence is minimal in the following sense: if any sequence has the counting function B(x)<=A(x) for all x>=1 and B(x) < A(x) for x>=x_0, then there exists an even integer N which is not expressible as a sum of two terms of such sequence. LINKS CROSSREFS Sequence in context: A138203 A225523 A007952 * A317827 A296768 A302596 Adjacent sequences:  A145816 A145817 A145818 * A145820 A145821 A145822 KEYWORD nonn AUTHOR Vladimir Shevelev, Oct 20 2008 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 April 14 04:20 EDT 2021. Contains 342941 sequences. (Running on oeis4.)