a(0) = 0; a(n+1) = 2*a(n) + k where k = 0 if prime(n+2)/prime(n+1) > prime(n+1)/prime(n), otherwise k = 1.
A215411
a(0) = 0; a(n+1) = 2*a(n) + k where k = 0 if prime(n+2)/prime(n+1) > prime(n+1)/prime(n), otherwise k = 1.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =2a(4) =5a(5) =10a(6) =21a(7) =42a(8) =84a(9) =169a(10) =338a(11) =677a(12) =1355a(13) =2710a(14) =5420a(15) =10841a(16) =21683a(17) =43366a(18) =86733a(19) =173467a(20) =346934a(21) =693869a(22) =1387738a(23) =2775476a(24) =5550953a(25) =11101907a(26) =22203814a(27) =44407629a(28) =88815258a(29) =177630516
External references
- oeis: A215411