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.
A215410
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) =1a(2) =2a(3) =5a(4) =10a(5) =21a(6) =42a(7) =85a(8) =171a(9) =342a(10) =685a(11) =1370a(12) =2740a(13) =5481a(14) =10963a(15) =21926a(16) =43852a(17) =87705a(18) =175410a(19) =350820a(20) =701641a(21) =1403282a(22) =2806565a(23) =5613131a(24) =11226262a(25) =22452524a(26) =44905049a(27) =89810098a(28) =179620197a(29) =359240395
External references
- oeis: A215410