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A363379 - OEIS
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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

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Last modified August 26 16:16 EDT 2024. Contains 375459 sequences. (Running on oeis4.)