Number of ordered quintuples (a,b,c,d,e) with gcd(a,b,c,d,e)=1 (1<= {a,b,c,d,e} <= n).

Terms

a(0) =1a(1) =31a(2) =241a(3) =991a(4) =3091a(5) =7501a(6) =16531a(7) =31711a(8) =57781a(9) =96601a(10) =157651a(11) =240031a(12) =362491a(13) =519961a(14) =739201a(15) =1012441a(16) =1383721a(17) =1822711a(18) =2409241a(19) =3091441a(20) =3966301a(21) =4974751a(22) =6257461a(23) =7680781a(24) =9481681a(25) =11474941a(26) =13916191a(27) =16610371a(28) =19911151a(29) =23435191