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A157893 Values of m in A080075. 3
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, 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, 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Michael De Vlieger, Table of n, a(n) for n = 1..10000

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, 5200, 2}], And[OddQ[#[[1]] ], #[[-1]] >= 1, 2^#[[-1]] > #[[1]] ] &][[All, -1]] (* Michael De Vlieger, Nov 04 2019 *)

CROSSREFS

Cf. A157892 Values of k in A080075.

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

Sequence in context: A331280 A317765 A318153 * A331253 A264116 A283368

Adjacent sequences:  A157890 A157891 A157892 * A157894 A157895 A157896

KEYWORD

nonn

AUTHOR

Zak Seidov, Mar 08 2009

STATUS

approved

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Last modified August 5 16:03 EDT 2020. Contains 336213 sequences. (Running on oeis4.)