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A157893 Values of m in A080075. 3

%I

%S 1,2,3,2,4,3,5,3,4,3,6,4,5,4,7,4,5,4,6,4,5,4,8,5,6,5,7,5,6,5,9,5,6,5,

%T 7,5,6,5,8,5,6,5,7,5,6,5,10,6,7,6,8,6,7,6,9,6,7,6,8,6,7,6,11,6,7,6,8,

%U 6,7,6,9,6,7,6,8,6,7,6,10,6,7,6,8,6,7,6,9,6,7,6,8,6,7,6,12,7,8,7,9,7,8,7,10

%N Values of m in A080075.

%H Michael De Vlieger, <a href="/A157893/b157893.txt">Table of n, a(n) for n = 1..10000</a>

%H Amelia Carolina Sparavigna, <a href="https://doi.org/10.5281/zenodo.3339313">Discussion of the groupoid of Proth numbers (OEIS A080075)</a>, Politecnico di Torino, Italy (2019).

%t Select[Table[Append[QuotientRemainder[#1, 2^#2], #2] & @@ {#, IntegerExponent[#, 2]} &[n - 1], {n, 3, 5200, 2}], And[OddQ[#[[1]] ], #[[-1]] >= 1, 2^#[[-1]] > #[[1]] ] &][[All, -1]] (* _Michael De Vlieger_, Nov 04 2019 *)

%Y Cf. A157892 Values of k in A080075.

%Y A080075 Proth numbers: of the form k*2^m + 1 for k odd, m >= 1 and 2^m > k.

%K nonn

%O 1,2

%A _Zak Seidov_, Mar 08 2009

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Last modified October 22 18:45 EDT 2021. Contains 348175 sequences. (Running on oeis4.)