# include <Adafruit_NeoPixel.h>
# define PIN 2          // the pin
# define NPIXELS (9 + 16 + 25)     // number of LEDs on strip

Adafruit_NeoPixel stab(NPIXELS, PIN, NEO_GRB + NEO_KHZ800); 

void setup() {
  Serial.begin(115200);
  Serial.println("\nHi Mom!\n");

  Serial.println(1 << 15);
  Serial.println(1ul << 15);
  

  smartLampSetup();
}

void smartLampSetup() {
  stab.begin();
  stab.setPixelColor(0, 0xff0000);
  stab.setPixelColor(1, 0x00ff00);
  stab.setPixelColor(NPIXELS - 1, 0x0000ff);
  stab.show();
  delay(777);
}

//unsigned long it = 1;
unsigned long long it = 0xa5f9;

void loop() {

  unsigned long long fIt = it;
  for (byte ii = 0; ii < NPIXELS; ii++) {
    stab.setPixelColor(ii, fIt & 0x1 ? 0x804060 : 0x103040);
    fIt >>= 1;
  }

  stab.show();
  delay(277);  // so sue me.

  advance();
}
// feed in the XOR of the feedback bits here 2^15 and 2^14
void advance0()
{
  it <<= 1;
  if (it & 0x8000)
    if (it & 0x4000); else it |= 1;  // <--

  else if (it & 0x4000) it |= 1;
}

void advance()
{
  it <<= 1;
  if (it & (1ul << 15))  // 0x8000ul, gack! chain reaction interesting affect
    if (it & (1 << 14)); else it |= 1;  // <--

  else if (it & (1 << 14)) it |= 1;
}