Number of squarefree integers in closed interval [2^n, -1 + 2*2^n], i.e., among 2^n consecutive numbers beginning with 2^n.

A077643

Number of squarefree integers in closed interval [2^n, -1 + 2*2^n], i.e., among 2^n consecutive numbers beginning with 2^n.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =5a(4) =9a(5) =19a(6) =39a(7) =79a(8) =157a(9) =310a(10) =621a(11) =1246a(12) =2491a(13) =4980a(14) =9958a(15) =19924a(16) =39844a(17) =79672a(18) =159365a(19) =318736a(20) =637457a(21) =1274916a(22) =2549816a(23) =5099651a(24) =10199363a(25) =20398663a(26) =40797299a(27) =81594571a(28) =163189087a(29) =326378438

External references