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A138824 Divisors of 4064 (the 4th perfect number divided by 2), written in base 2. 1
1, 10, 100, 1000, 10000, 100000, 1111111, 11111110, 111111100, 1111111000, 11111110000, 111111100000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) has n digits. See A138814 for more information.

LINKS

Table of n, a(n) for n=1..12.

Index entries for sequences related to divisors of numbers

EXAMPLE

The structure of divisors of 4064 (see A138814)

.................................................................

n ........... Divisor . Formula ....... Divisor written in base 2

.................................................................

1) ................ 1 = 2^0 ........... 1

2) ................ 2 = 2^1 ........... 10

3) ................ 4 = 2^2 ........... 100

4) ................ 8 = 2^3 ........... 1000

5) ............... 16 = 2^4 ........... 10000

6) A134708(4) = .. 32 = 2^5 ........... 100000

7) A000668(4) = . 127 = 2^7 - 2^0 ..... 1111111

8) .............. 254 = 2^8 - 2^1 ..... 11111110

9) .............. 508 = 2^9 - 2^2 ..... 111111100

10) ............ 1016 = 2^10- 2^3 ..... 1111111000

11) ............ 2032 = 2^11- 2^4 ..... 11111110000

12) A133028(4) = 4064 = 2^12- 2^5 ..... 111111100000

MATHEMATICA

FromDigits/@(IntegerDigits[#, 2]&/@Divisors[4064]) (* Harvey P. Dale, Oct 12 2016 *)

CROSSREFS

Perfect number divided by 2: A133028. Cf. A000043, A000396, A000668, A090748, A134708, A135654, A138814.

Sequence in context: A290668 A290553 A290299 * A273495 A267044 A266445

Adjacent sequences:  A138821 A138822 A138823 * A138825 A138826 A138827

KEYWORD

easy,fini,full,nonn,less

AUTHOR

Omar E. Pol, Mar 31 2008

STATUS

approved

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Last modified November 20 02:34 EST 2019. Contains 329323 sequences. (Running on oeis4.)