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!)
A363379 Numbers k such that the sum of the first k terms of A180405 is composite. 3
5, 9, 13, 17, 21, 25, 27, 33, 41, 47, 55, 61, 65, 69, 75, 83, 89, 95, 105, 107, 113, 119, 125, 128, 133, 139, 145, 155, 161, 165, 171, 179, 183, 189, 197, 201, 207, 211, 217, 225, 231, 237, 241, 247, 255, 261, 267, 271, 279, 285, 289, 297, 303, 307, 313, 319, 327, 333, 339, 343, 351 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
The construction in A180405 means terms here cannot be terms there, but do any other numbers never occur there?
Indices of composite terms in A363450 (partial sums of A180405).
a(24)=128 is possibly the only even term in the sequence (checked for 6000 terms).
LINKS
CROSSREFS
Sequence in context: A314667 A086408 A141135 * A194395 A162502 A004766
KEYWORD
nonn,easy
AUTHOR
Neal Gersh Tolunsky, May 29 2023
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 February 29 10:50 EST 2024. Contains 370425 sequences. (Running on oeis4.)