How many numbers satisfy the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="$3x + 1$"><mml:mn>3</mml:mn><mml:mi>x</mml:mi><mml:mo>+</mml:mo><mml:mn>1</mml:mn></mml:math>conjecture?
International journal of mathematics and mathematical sciences