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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A025117 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (odd natural numbers), t = (primes). 1
3, 5, 22, 32, 81, 111, 212, 256, 429, 519, 794, 926, 1329, 1537, 2092, 2368, 3109, 3427, 4376, 4818, 6001, 6495, 7938, 8542, 10287, 11075, 13148, 14074, 16491, 17505, 20314, 21444, 24679, 26067, 29768, 31298, 35493, 37249, 41972, 44054, 49343, 51607, 57494 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..43.

MATHEMATICA

Table[Sum[(2 k - 1) Prime[n - k + 2], {k, Floor[(n + 1)/2]}], {n, 50}] (* Wesley Ivan Hurt, Jan 18 2022 *)

CROSSREFS

Sequence in context: A025112 A203192 A025098 * A318076 A124423 A209109

Adjacent sequences:  A025114 A025115 A025116 * A025118 A025119 A025120

KEYWORD

nonn

AUTHOR

Clark Kimberling

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 1 21:27 EDT 2022. Contains 354975 sequences. (Running on oeis4.)