A138823 Divisors of 248 (the 3rd perfect number divided by 2), written in base 2.
1, 10, 100, 1000, 11111, 111110, 1111100, 11111000
Offset: 1
Examples
The structure of divisors of 248 (see A018355) .................................................................. n ............ Divisor . Formula ....... Divisor written in base 2 .................................................................. 1) ................. 1 = 2^0 ........... 1 2) ................. 2 = 2^1 ........... 10 3) ................. 4 = 2^2 ........... 100 4) A134708(3) = .... 8 = 2^3 ........... 1000 5) A000668(3) = ... 31 = 2^5 - 2^0 ..... 11111 6) ................ 62 = 2^6 - 2^1 ..... 111110 7) ............... 124 = 2^7 - 2^2 ..... 1111100 8) A133028(3) = .. 248 = 2^8 - 2^3 ..... 11111000
Crossrefs
Programs
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Mathematica
FromDigits[IntegerDigits[#,2]]&/@Divisors[248] (* Harvey P. Dale, Apr 01 2017 *)
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PARI
divisors(248) \\ Charles R Greathouse IV, Sep 06 2016
Comments