Characters that cause exceptions when URL encoded

try{
   encodeURIComponent(String.fromCodePoint(55296))
} catch {
   alert(55296);
} 

try{
   encodeURIComponent(String.fromCodePoint(55297))
} catch {
   alert(55297);
} 

try{
   encodeURIComponent(String.fromCodePoint(55298))
} catch {
   alert(55298);
} 

try{
   encodeURIComponent(String.fromCodePoint(55299))
} catch {
   alert(55299);
} 

try{
   encodeURIComponent(String.fromCodePoint(55300))
} catch {
   alert(55300);
} 

try{
   encodeURIComponent(String.fromCodePoint(55301))
} catch {
   alert(55301);
} 

try{
   encodeURIComponent(String.fromCodePoint(55302))
} catch {
   alert(55302);
} 

try{
   encodeURIComponent(String.fromCodePoint(55303))
} catch {
   alert(55303);
} 

try{
   encodeURIComponent(String.fromCodePoint(55304))
} catch {
   alert(55304);
} 

try{
   encodeURIComponent(String.fromCodePoint(55305))
} catch {
   alert(55305);
} 

try{
   encodeURIComponent(String.fromCodePoint(55306))
} catch {
   alert(55306);
} 

try{
   encodeURIComponent(String.fromCodePoint(55307))
} catch {
   alert(55307);
} 

try{
   encodeURIComponent(String.fromCodePoint(55308))
} catch {
   alert(55308);
} 

try{
   encodeURIComponent(String.fromCodePoint(55309))
} catch {
   alert(55309);
} 

try{
   encodeURIComponent(String.fromCodePoint(55310))
} catch {
   alert(55310);
} 

try{
   encodeURIComponent(String.fromCodePoint(55311))
} catch {
   alert(55311);
} 

try{
   encodeURIComponent(String.fromCodePoint(55312))
} catch {
   alert(55312);
} 

try{
   encodeURIComponent(String.fromCodePoint(55313))
} catch {
   alert(55313);
} 

try{
   encodeURIComponent(String.fromCodePoint(55314))
} catch {
   alert(55314);
} 

try{
   encodeURIComponent(String.fromCodePoint(55315))
} catch {
   alert(55315);
}