# A084962 Fibonaccieth recurrence starting at 6
# Computed using Scala. REPL session transcript after a(4).
0 6
1 8
2 21
3 10946
4 1695216512765707006912636688460460939847003870309508922628952074964839551507932246702558869475815748
  4170601553635113401905907399029110700002797308506817311051514274330676300500781749183694624278907584
  4284222480507508346716494560703368339751648446746930522234006193293533485374402248297415897454543259
  1789827731209030557372256633930683149839626409717124839169824608221506833596891410543329137660619312
  0903601697945861945514471877887994857185154165799934822489818762758644456391930222733104608713892459
  9311509427252460568924379908119228356481505976716563086312202814067154151545196482976439530571937081
  1553817271149380826315230466023026507002229854205437876952547778893000768229990345631410718657870941
  3659968056863653918892448893243407287498267367219186008819448765174691702330255652275700355510680375
  3743127248972354802770527248287746612321069177803788824237870555679432298570863423665404675962694568
  4288864858164686560731839561086029834227227816364375668321265525199377734810991270972560043794159235
  0552174844481023079892676683316165071199177414544946973705484778311550808524118410883574020863749299
  7207306247286708499409942874104693989372750913222637392366182887235517462836731464791968733111414619
  0690996594999860375908597954292079395347372215694053517889302266566670064586452163221750250306444619
  0282247896793365368698107194562467628374642681240527079779917533397231472489998620046322372821325486
  6256812034573842997505118077925673378404024138374424588598581652394877471466398871932625599862169286
  4913270769701218155844595921986391057257689253846347585946379527797730636504822886546148569750291310
  2438361701452885037855020005633383121100572341366983806005212425954875056823234454895523776142878208
  8008539463401725909235072898016795926740421339799141683922617611820698792848810383119368412380701939
  7393332761648298911039072318451469917447711557560674728037013846630363725119342269150068435533855347
  5400184859177553029291489412697447302450650481738765308799044735317096361906473580139216243171296120
  2819207533231514750569876884901338711673280350278892610526027415283386317679082469437884535799492015
  6285102532746081296811489452507281248647347483114535980360513996487400387867943861990334516754379237
  2013161434064846335876493427322720159695151529805660626140856032862097770881297257812353

# Scala REPL session transcript (slightly edited)
# To reproduce, in your own local Scala REPL, repeat the commands, not the prompts and not "# "
# Comments after "//" may also be omitted when reproducing these results

# Microsoft Windows [Version 10.0.18363.778]
# (c) 2019 Microsoft Corporation. All rights reserved.

# C:\Users\AL>scala
# Welcome to Scala 2.13.1 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_251).
# Type in expressions for evaluation. Or try :help.

# scala> // Definition of fibs from https://www.scala-lang.org/api/current/scala/collection/immutable/LazyList.html

# scala> val fibs: LazyList[BigInt] = BigInt(0) #:: BigInt(1) #:: fibs.zip(fibs.tail).map { n => n._1 + n._2 }
# fibs: LazyList[BigInt] = LazyList(<not computed>)

# scala> fibs(6)
# res0: BigInt = 8

# scala> fibs(8)
# res1: BigInt = 21

# scala> fibs(21)
# res2: BigInt = 10946

# scala> fibs(10946) // It showed more digits than this, but still not the whole thing
# res3: BigInt = 1695216512765707...

# scala> var fibs10946Str = res3.toString // It showed more characters than this, but still not the whole thing
# fibs10946Str: String = 1695216512765707...

# scala> import java.io.File
# import java.io.File

# scala> import java.io.FileWriter
# import java.io.FileWriter

# scala> // You may use a different file pathname if desired

# scala> val path = System.getProperty("user.home") + File.separatorChar + "fibs10946.txt"
# path: String = C:\Users\AL\fibs10946.txt

# scala> val file = new File(path)
# file: java.io.File = C:\Users\AL\fibs10946.txt

# scala> file.createNewFile
# res4: Boolean = true

# scala> val writer = new FileWriter(file) // FileWriter will probably have different number after "@"
# writer: java.io.FileWriter = java.io.FileWriter@5f5076f9

# scala> // Start index for java.lang.String.substring() is inclusive, end index is exclusive

# scala> for (n <- 0 to 2100 by 100) writer.write(fibs10946Str.substring(n, n + 100) + "\n")

# scala> writer.write(fibs10946Str.substring(2200) + "\n")

# scala> writer.close

# scala> :q

# C:\Users\AL> rem Now to check this is in Wolfram Mathematica (not in transcript)