A182305 a(n+1) = a(n) + floor(a(n)/4) with a(0)=4.

4, 5, 6, 7, 8, 10, 12, 15, 18, 22, 27, 33, 41, 51, 63, 78, 97, 121, 151, 188, 235, 293, 366, 457, 571, 713, 891, 1113, 1391, 1738, 2172, 2715, 3393, 4241, 5301, 6626, 8282, 10352, 12940, 16175, 20218, 25272, 31590, 39487

Offset: 0

Author

Alex Ratushnyak, Apr 23 2012

Keywords

• nonn

Examples

			a(8) = a(7)+floor(a(7)/4) = 15 + 3 = 18.
		

Crossrefs

Cf. A061418, A100585.

Programs

Mathematica

NestList[#+Floor[#/4]&,4,50] (* Harvey P. Dale, Oct 06 2020 *)

Python

a=4
for i in range(55):
   print(a, end=',')
   a += a//4

Python

from itertools import islice
def A182305_gen(): # generator of terms
    a = 4
    while True:
        yield a
        a += a>>2
A182305_list = list(islice(A182305_gen(),30)) # Chai Wah Wu, Sep 21 2022