A381255 Positive integers not of the form round(2^(k+2)/5). Complement of A007910.

4, 5, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74

Offset: 1

Author

Chai Wah Wu, Apr 21 2025

Keywords

• nonn

Crossrefs

Cf. A007910.

Programs

Python

def A381255(n): return (m:=n-2+(k:=(5*n+3).bit_length()))+(m>=((1<
				

Formula

a(n) = m+1 if m>=floor((2^k+2)/5) otherwise a(n) = m where k = floor(log_2(5*n+3))+1 and m = n-2+k.