Just another update

Task/Self-referential-sequence/Groovy/self-referential-sequence-1.groovy

@@ -1,13 +1,26 @@
 Number.metaClass.getSelfReferentialSequence = {
-    def number = delegate as String; def sequence = []
+  def number = delegate as String; def sequence = []
 
-    while (!sequence.contains(number)) {
-        sequence << number
-        def encoded = new StringBuilder()
-        ((number as List).sort().join('').reverse() =~ /(([0-9])\2*)/).each { matcher, text, digit ->
-            encoded.append(text.size()).append(digit)
-        }
-        number = encoded.toString()
+  while (!sequence.contains(number)) {
+    sequence << number
+    def encoded = new StringBuilder()
+    ((number as List).sort().join('').reverse() =~ /(([0-9])\2*)/).each { matcher, text, digit ->
+      encoded.append(text.size()).append(digit)
     }
-    sequence
+    number = encoded.toString()
+  }
+  sequence
+}
+
+def maxSeqSize = { List values ->
+  values.inject([seqSize: 0, seeds: []]) { max, n ->
+    if (n % 100000 == 99999) println 'HT'
+    else if (n % 10000 == 9999) print '.'
+    def seqSize = n.selfReferentialSequence.size()
+    switch (seqSize) {
+      case max.seqSize: max.seeds << n
+      case { it < max.seqSize }: return max
+      default: return [seqSize: seqSize, seeds: [n]]
+    }
+  }
 }

Task/Self-referential-sequence/Groovy/self-referential-sequence-2.groovy

@@ -1 +1,7 @@
-9009.selfReferentialSequence.each { println it }
+def max = maxSeqSize(0..<1000000)
+
+println "\nLargest sequence size among seeds < 1,000,000\n"
+println "Seeds: ${max.seeds}\n"
+println "Size: ${max.seqSize}\n"
+println "Sample sequence:"
+max.seeds[0].selfReferentialSequence.each { println it }