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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
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