Tvira gung pbhagevrf ner nyybjrq gb zrrg ng gurve pbearef V oryvrir gur fbyhgvba vf avargrra pbhagevrf, naq V pna cebir vg ba bar fznyy pbaqvgvba.

Yrg gur ahzore bs a-ghcyl ynaqybpxrq pbhagevrf or nv sbe v terngre guna be rdhny gb mreb, n0 orvat gur ahzore bs pbhagevrf ba gur pbnfg. Fvapr pbhagevrf ner nyybjrq gb zrrg ng gurve pbearef vg'f rnfl gb znxr n znc jurer nyy a-ghcyl ynaqybpxrq pbhagevrf zrrg nyy gur (a+1)-ghcyl ynaqybpxrq pbhagevrf (sbe rknzcyr unir nyy pbhagevrf orvat pbapragevp evatf, naq gura sbe rnpu a unir n "cvapu" jurer nyy gur a-ghcyl naq (a+1)-ghcyl ynaqybpxrq pbhagevrf zrrg ng n fvatyr cbvag). Pyrneyl ab fbyhgvba pna or znqr jbefr ol nqqvat fhpu obeqref, naq urapr jr pna nffhzr gur fbyhgvba unf guvf sbez. Fb vg erznvaf gb svaq ahzoref nv fhpu gung gur pbaqvgvbaf va gur ceboyrz ner fngvfsvrq.

Yrg hf nffhzr gung n6=1 naq gung nv=0 sbe v>6 (guvf vf gur fznyy pbaqvgvba gung V pnaabg cebir). Gur gbgny ahzore bs pbhagevrf vf gur fhz bs gur nv, naq gur gbgny ahzore bs arvtuobhef vf gur fhz bire v bs nv(n(v-1)+nv+n(v+1)-1). Jr unir fvk ahzoref (anzryl gur nv sbe v orgjrra mreb naq svir) gung jr jvfu gb bcgvzvfr. Yrg hf gel gb svaq gur bcgvzny inyhrf bs gurfr nv nzbat gur erny ahzoref. Guvf jvyy tvir hf n ybjre obhaq ba gur ahzore bs pbhagevrf arrqrq, fvapr nal vagrtre fbyhgvba jvyy nyfb or n erny fbyhgvba. Jr pna nffhzr gur nirentr ahzore bs arvtuobhef vf pbafgenvarq gb or rknpgyl fvk, fvapr nal fbyhgvba jvgu gur nirentr terngre guna guvf pna or vzcebirq ol erqhpvat nal bs gur nv.

Fbyivat gur ceboyrz hfvat Yntenatr zhygvcyvref tvirf gung gur fhz bs gur nv vf ng yrnfg 18.53. Urapr gur zvavzhz cbffvoyr vagrtre fbyhgvba vf avargrra. Va snpg guvf vf npuvrinoyr, sbe rknzcyr gnxvat gur nv gb or (va beqre bs vapernfvat v) svir, gjb, guerr, gjb, gjb, sbhe, bar. Guvf fbyhgvba (naq fbzr bgure fbyhgvbaf) pna or sbhaq arne gur erny ahzore fbyhgvba.

EDIT: Here's a picture of such an island: http://i157.photobucket.com/albums/t43/Macbi/sextuplylandlocked.png?t=1485712658