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A179460 Numbers m for which 2*A179382(m)=A002326(m-1). 3
2, 3, 5, 6, 7, 9, 10, 13, 14, 15, 17, 19, 21, 22, 27, 29, 30, 31, 33, 34, 35, 39, 41, 42, 49, 50, 51, 54, 55, 57, 61, 63, 65, 66, 69, 70, 71, 73, 75, 79, 82, 85, 86, 87, 89, 90, 91, 93, 97, 99, 101, 102, 103, 104, 105, 106, 107, 114, 115, 121, 122, 125, 126, 129, 133, 135 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

m is in the sequence iff the set {1,2,...,2^(2*m-2)} considered in reduced residue system modulo 2*m-1 contains the same number of odd and even integers.

LINKS

Table of n, a(n) for n=1..66.

EXAMPLE

5 in the sequence since modulo 2*5-1=9 we have {1,2,4,8,16,32}={1,2,4,8,7,5} and the last set contains 3 odd and 3 even elements.

MATHEMATICA

fQ[n_] := Block[{r = Union@ PowerMod[2, Range[0, 2 n - 2], 2 n - 1]}, Length@ r == 2 Count[ OddQ@ r, True]]; Select[ Range@ 138, fQ] (* Robert G. Wilson v, Aug 26 2010 *)

CROSSREFS

Cf. A002326, A179382.

Sequence in context: A038161 A158746 A062470 * A171886 A018559 A057196

Adjacent sequences:  A179457 A179458 A179459 * A179461 A179462 A179463

KEYWORD

nonn

AUTHOR

Vladimir Shevelev, Jul 14 2010

EXTENSIONS

More terms from Robert G. Wilson v, Aug 26 2010

STATUS

approved

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Last modified November 24 12:59 EST 2020. Contains 338613 sequences. (Running on oeis4.)