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A157892 Values of k in A080075. 3
1, 1, 1, 3, 1, 3, 1, 5, 3, 7, 1, 5, 3, 7, 1, 9, 5, 11, 3, 13, 7, 15, 1, 9, 5, 11, 3, 13, 7, 15, 1, 17, 9, 19, 5, 21, 11, 23, 3, 25, 13, 27, 7, 29, 15, 31, 1, 17, 9, 19, 5, 21, 11, 23, 3, 25, 13, 27, 7, 29, 15, 31, 1, 33, 17, 35, 9, 37, 19, 39, 5, 41, 21, 43, 11, 45, 23, 47, 3, 49, 25, 51, 13 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
LINKS
Zak Seidov, A157892
Amelia Carolina Sparavigna, Discussion of the groupoid of Proth numbers (OEIS A080075), Politecnico di Torino, Italy (2019).
MATHEMATICA
Select[Table[Append[QuotientRemainder[#1, 2^#2], #2] & @@ {#, IntegerExponent[#, 2]} &[n - 1], {n, 3, 3360, 2}], And[OddQ[#[[1]] ], #[[-1]] >= 1, 2^#[[-1]] > #[[1]] ] &][[All, 1]] (* Michael De Vlieger, Nov 04 2019 *)
CROSSREFS
Cf. A157893 (Values of m in A080075).
Cf. A080075 (Proth numbers : of the form k*2^m + 1 for k odd, m >= 1 and 2^m > k).
Sequence in context: A317937 A322436 A013603 * A264441 A351566 A346241
KEYWORD
nonn
AUTHOR
Zak Seidov, Mar 08 2009
STATUS
approved

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)