ref: D. Robbins, Average distance between two points in a box,
Amer. Mathematical Monthly, 85.4 1978 p.278
0.6617071822671762351558311332484135817464001357909536048089442294
7958464613859763130665248076810712015170977531075941097247868058
1643721687453324207229824442327640922920607860008648053326693895
1526942028215425692085403456100394606163834472771107263924054689
7434592322069695104571767853038748238911194887130919810475594295
3120545589150326753940164393320790294473473479010132900154516660
0642731445463113650395856252896443964373900626507351434749911653
3540376378675705958829699270063500978386289740462915842777306955
7430187885803716470017544601967121335982623876512065551505953382
8281442492815931568016481658129911912468681742538796067114408338
5962036245968755328720698995275209149543768315871982607183656932
7991821337185639447759795860031495377302353537591681976432088663
8761213723743456544539160466691236289725645485547899749367949903
6787454198087305903903975046429880243733984398127096523272663805
7779297187173093916715126325857845393789259694776116795702854531
2570851202124609101739182422265676598386800760949577826879652854
4/105+17/105*2^(1/2)-2/35*3^(1/2)+1/5*ln(1+2^(1/2))+2/5*ln(2+3^(1/2))-1/15*Pi;
-----------------------------------------------------------------------------
Salem Constant
ref : D.
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