A145679 Lower limit of backward value of 2^n and n!.

2, 1, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0

Offset

1,1

Comments

For n!, omitting the trailing sequence zeros. - Simon Plouffe, Mar 05 2017

The terms are deduced from sequence A023415.

The sum of constants in A145679 and A023415 is conjectured to be 11 exactly.

Links

Table of n, a(n) for n=1..88.

Prog

(Python)
# lower limit of backward value of 2^n
a, i=2, 0; x=a
while 1:
     i+=1; print x, ', ' ,
     if a%2**(i+1) == 0: x=0
     else: x=1; a+=10**i
# Cezary Glowacz, Mar 11 2017

Crossrefs

Cf. A000079, A004154, A023415, A158624, A158625.

Sequence in context: A089311 A086784 A104162 * A007273 A016319 A342531

Adjacent sequences: A145676 A145677 A145678 * A145680 A145681 A145682

Keyword

nonn,base

Author

Simon Plouffe, Mar 23 2009

Extensions

More terms from Cezary Glowacz, Feb 26 2017

More terms from Jinyuan Wang, Mar 01 2020

Status

approved