added new functions in ``ntheory.rst``
added new functions in ``ntheory.rst``

VaibhavAgarwalVA/sympy,sunny94/temp,Sumith1896/sympy,Shaswat27/sympy,ga7g08/sympy,ChristinaZografou/sympy,Davidjohnwilson/sympy,iamutkarshtiwari/sympy,abloomston/sympy,hargup/sympy,moble/sympy,pandeyadarsh/sympy,Titan-C/sympy,souravsingh/sympy,jaimahajan1997/sympy,VaibhavAgarwalVA/sympy,lindsayad/sympy,ga7g08/sympy,shipci/sympy,chaffra/sympy,VaibhavAgarwalVA/sympy,skidzo/sympy,Gadal/sympy,yukoba/sympy,Arafatk/sympy,ahhda/sympy,MridulS/sympy,wyom/sympy,sahilshekhawat/sympy,sampadsaha5/sympy,chaffra/sympy,emon10005/sympy,sahilshekhawat/sympy,toolforger/sympy,ChristinaZografou/sympy,Gadal/sympy,emon10005/sympy,MechCoder/sympy,kmacinnis/sympy,bukzor/sympy,postvakje/sympy,Sumith1896/sympy,Curious72/sympy,lidavidm/sympy,dqnykamp/sympy,iamutkarshtiwari/sympy,wyom/sympy,drufat/sympy,beni55/sympy,hrashk/sympy,kumarkrishna/sympy,oliverlee/sympy,hrashk/sympy,garvitr/sympy,grevutiu-gabriel/sympy,abloomston/sympy,debugger22/sympy,Designist/sympy,Davidjohnwilson/sympy,mafiya69/sympy,cccfran/sympy,lindsayad/sympy,madan96/sympy,yashsharan/sympy,kaichogami/sympy,AkademieOlympia/sympy,mcdaniel67/sympy,maniteja123/sympy,wanglongqi/sympy,ga7g08/sympy,madan96/sympy,Arafatk/sympy,mafiya69/sympy,kevalds51/sympy,emon10005/sympy,kevalds51/sympy,pbrady/sympy,cccfran/sympy,meghana1995/sympy,kaushik94/sympy,lidavidm/sympy,meghana1995/sympy,kaichogami/sympy,yashsharan/sympy,debugger22/sympy,beni55/sympy,Vishluck/sympy,aktech/sympy,grevutiu-gabriel/sympy,shikil/sympy,meghana1995/sympy,skidzo/sympy,vipulroxx/sympy,saurabhjn76/sympy,yashsharan/sympy,kaushik94/sympy,rahuldan/sympy,Vishluck/sympy,dqnykamp/sympy,farhaanbukhsh/sympy,beni55/sympy,MridulS/sympy,hargup/sympy,kevalds51/sympy,MechCoder/sympy,sahmed95/sympy,jbbskinny/sympy,toolforger/sympy,rahuldan/sympy,jbbskinny/sympy,ahhda/sympy,drufat/sympy,Mitchkoens/sympy,cswiercz/sympy,jamesblunt/sympy,liangjiaxing/sympy,toolforger/sympy,diofant/diofant,pandeyadarsh/sympy,asm666/sympy,postvakje/sympy,shikil/sympy,Mitchkoens/sympy,atsao72/sympy,rahuldan/sympy,jamesblunt/sympy,saurabhjn76/sympy,souravsingh/sympy,lidavidm/sympy,kaushik94/sympy,sampadsaha5/sympy,pbrady/sympy,Shaswat27/sympy,lindsayad/sympy,farhaanbukhsh/sympy,kmacinnis/sympy,postvakje/sympy,jerli/sympy,mafiya69/sympy,Curious72/sympy,atreyv/sympy,AunShiLord/sympy,abhiii5459/sympy,jaimahajan1997/sympy,maniteja123/sympy,garvitr/sympy,kumarkrishna/sympy,kumarkrishna/sympy,abloomston/sympy,atreyv/sympy,maniteja123/sympy,Arafatk/sympy,bukzor/sympy,oliverlee/sympy,kaichogami/sympy,mcdaniel67/sympy,AkademieOlympia/sympy,saurabhjn76/sympy,yukoba/sympy,ahhda/sympy,oliverlee/sympy,liangjiaxing/sympy,bukzor/sympy,grevutiu-gabriel/sympy,jerli/sympy,jerli/sympy,moble/sympy,abhiii5459/sympy,wanglongqi/sympy,wanglongqi/sympy,Titan-C/sympy,AunShiLord/sympy,shikil/sympy,asm666/sympy,cccfran/sympy,wyom/sympy,vipulroxx/sympy,jaimahajan1997/sympy,Designist/sympy,MridulS/sympy,Davidjohnwilson/sympy,drufat/sympy,asm666/sympy,debugger22/sympy,cswiercz/sympy,AunShiLord/sympy,chaffra/sympy,sunny94/temp,aktech/sympy,iamutkarshtiwari/sympy,Shaswat27/sympy,Vishluck/sympy,moble/sympy,jbbskinny/sympy,skirpichev/omg,vipulroxx/sympy,Titan-C/sympy,liangjiaxing/sympy,Sumith1896/sympy,atsao72/sympy,pandeyadarsh/sympy,Mitchkoens/sympy,Designist/sympy,sahilshekhawat/sympy,hrashk/sympy,kmacinnis/sympy,madan96/sympy,farhaanbukhsh/sympy,atreyv/sympy,cswiercz/sympy,yukoba/sympy,shipci/sympy,MechCoder/sympy,mcdaniel67/sympy,sunny94/temp,garvitr/sympy,Curious72/sympy,sahmed95/sympy,ChristinaZografou/sympy,dqnykamp/sympy,Gadal/sympy,aktech/sympy,jamesblunt/sympy,souravsingh/sympy,skidzo/sympy,pbrady/sympy,hargup/sympy,sahmed95/sympy,sampadsaha5/sympy,atsao72/sympy,shipci/sympy,AkademieOlympia/sympy,abhiii5459/sympy