The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A267087 a(n) = ceiling(A007504(n)/n) + floor(A007504(n)/n). 0
 4, 5, 7, 9, 11, 13, 17, 19, 23, 25, 29, 33, 37, 41, 43, 47, 51, 55, 59, 63, 67, 71, 76, 81, 85, 89, 93, 97, 103, 107, 111, 115, 121, 125, 131, 135, 139, 145, 149, 155, 159, 165, 169, 175, 179, 183, 189, 195, 199, 205, 209, 215, 220, 225, 231, 235, 241 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Primes not in this sequence 2, 3, 31, 53, 61, 73, 79, 83, 101, 109, 113, 127, 137, 151,... a(n) is even for n=1, 23, 53, 853, ... see A045345. It appears that there are infinitely many even terms in this sequence but that they have density zero. REFERENCES Javier Cilleruelo and Florian Luca, On the sum of the first n primes, Q. J. Math. 59:4 (2008), 14 pp. LINKS MATHEMATICA Table[Ceiling[(Plus@@Prime[Range[n]])/n]+Floor[(Plus@@Prime[Range[n]])/n], {n, 100}] CROSSREFS Cf. A007504, A045345, A060620, A158682, A225804, A267084. Sequence in context: A032492 A223134 A339690 * A050560 A204664 A349482 Adjacent sequences: A267084 A267085 A267086 * A267088 A267089 A267090 KEYWORD nonn,easy AUTHOR Ctibor O. Zizka, Jan 10 2016 STATUS approved

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

Last modified January 29 13:06 EST 2023. Contains 359923 sequences. (Running on oeis4.)