#include <Adafruit_NeoPixel.h>
Adafruit_NeoPixel strip(60, 2, NEO_GRB + NEO_KHZ800);

void setup()
{strip.begin();}

void loop()
{for(long firstPixelHue = 0; firstPixelHue < 3*65536; firstPixelHue += 256)
  {
    for(int i=0; i<strip.numPixels(); i++)
    { 
    int pixelHue = firstPixelHue + (i * 65536L / strip.numPixels());
    strip.setPixelColor(i, strip.gamma32(strip.ColorHSV(pixelHue)));
    }
    strip.show();
  }
}