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A053159 n+cototient(n) is a power of 2. 0
1, 3, 7, 10, 20, 31, 40, 80, 127, 160, 320, 322, 640, 644, 1280, 1288, 2560, 2576, 5120, 5152, 8191, 10240, 10304, 20480, 20608, 40960, 41216, 81920, 82432, 131071, 163840, 164864, 327680, 329728, 333634, 524287, 655360, 659456, 667268 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

See especially A053579 and also A053576, A053577.

FORMULA

a(n)+A051953(n)=2*a(n)-A000010(n)=2^w for some w.

EXAMPLE

Mersenne primes is a proper subset of this sequence: A(M)=2M-M+1=M+1=2^p

CROSSREFS

A000043, A000668, A001348.

Sequence in context: A167390 A000223 A031328 * A024464 A127277 A041437

Adjacent sequences:  A053156 A053157 A053158 * A053160 A053161 A053162

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Feb 29 2000

EXTENSIONS

More terms from Reiner Martin (reinermartin(AT)hotmail.com), Dec 24 2001

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Last modified February 13 08:12 EST 2012. Contains 205451 sequences.