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A118735 Numbers n such that 2^n and 3^n have odd digit sum. 3
0, 4, 5, 10, 16, 18, 20, 22, 25, 27, 30, 31, 34, 35, 39, 48, 52, 53, 59, 62, 63, 66, 68, 69, 81, 87, 89, 92, 99, 100, 101, 105, 108, 114, 118, 119, 121, 127, 131, 133, 141, 145, 146, 150, 153, 158, 159, 160, 165, 167, 169, 175, 186, 188, 191, 196, 197, 201, 202, 203 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[0, 206], And @@ ((Mod[ Plus @@ IntegerDigits[ # ], 2] == 1 &) /@ {2^#, 3^#}) &] (* Ray Chandler, Jun 10 2006 *)

odsQ[n_]:=AllTrue[Total[IntegerDigits[#]]&/@{2^n, 3^n}, OddQ]; Select[ Range[ 0, 250], odsQ] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jun 05 2021 *)

CROSSREFS

Cf. Intersection of A118731 and A118732.

Sequence in context: A131780 A354968 A102006 * A002970 A073611 A058594

Adjacent sequences: A118732 A118733 A118734 * A118736 A118737 A118738

KEYWORD

base,nonn

AUTHOR

Zak Seidov, May 22 2006

EXTENSIONS

Extended by Ray Chandler, Jun 10 2006

STATUS

approved

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Last modified February 8 00:05 EST 2023. Contains 360133 sequences. (Running on oeis4.)