A367361 Comma transform of powers of 2.

12, 24, 48, 81, 63, 26, 41, 82, 65, 21, 42, 84, 68, 21, 43, 86, 61, 22, 45, 81, 62, 24, 48, 81, 63, 26, 41, 82, 65, 21, 42, 84, 68, 21, 43, 86, 61, 22, 45, 81, 62, 24, 48, 81, 63, 27, 41, 82, 65, 21, 42, 84, 69, 21, 43, 87, 61, 22, 45, 81, 62, 24, 49, 81, 63, 27, 41, 82, 65, 21, 42, 84, 69, 21, 43, 87, 61, 23, 46, 81

Offset

0,1

Comments

See A367360 for further information.

Links

Michael De Vlieger, Table of n, a(n) for n = 0..10000

Formula

a(n) = 10 * A000689(n) + A008952(n+1). - Alois P. Heinz, Nov 22 2023

Mathematica

FromDigits /@ Partition[Rest@ Flatten[{First[#], Last[#]} & /@ IntegerDigits[2^Range[0, 120]]], 2, 2] (* Michael De Vlieger, Nov 22 2023 *)

Prog

(Python)
from itertools import count, islice, pairwise
def S(): yield from (str(2**i) for i in count(0))
def agen(): yield from (int(t[-1]+u[0]) for t, u in pairwise(S()))
print(list(islice(agen(), 80))) # Michael S. Branicky, Nov 22 2023
(Python)
def A367361(n): return (60, 20, 40, 80)[n&3]+int(str(1<<n+1)[0]) if n else 12 # Chai Wah Wu, Dec 22 2023

Crossrefs

Cf. A000079, A000689, A008952, A166499, A367360.

Sequence in context: A181924 A367105 A270257 * A180617 A081808 A369798

Adjacent sequences: A367358 A367359 A367360 * A367362 A367363 A367364

Keyword

nonn,base

Author

N. J. A. Sloane, Nov 22 2023

Status

approved