a(n) is the number of numbers k with 2^(n-1) < k <= 2^n having a number of divisors that is a power of 2.
A036539
a(n) is the number of numbers k with 2^(n-1) < k <= 2^n having a number of divisors that is a power of 2.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =5a(4) =11a(5) =22a(6) =44a(7) =89a(8) =178a(9) =351a(10) =702a(11) =1413a(12) =2817a(13) =5634a(14) =11273a(15) =22542a(16) =45077a(17) =90150a(18) =180322a(19) =360621a(20) =721233a(21) =1442482a(22) =2884968a(23) =5769917a(24) =11539863a(25) =23079674a(26) =46159310a(27) =92318616a(28) =184637146a(29) =369274400
External references
- oeis: A036539