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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 Michael De Vlieger, Table of n, a(n) for n = 1..10000 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 A346241 A328573 Adjacent sequences:  A157889 A157890 A157891 * A157893 A157894 A157895 KEYWORD nonn AUTHOR Zak Seidov, Mar 08 2009 STATUS approved

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Last modified July 25 19:34 EDT 2021. Contains 346291 sequences. (Running on oeis4.)