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A049095 2^n+1 is square-free. +0
4
1, 2, 4, 5, 6, 7, 8, 11, 12, 13, 14, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 28, 29, 31, 32, 34, 35, 36, 37, 38, 40, 41, 42, 43, 44, 46, 47, 48, 49, 52, 53, 54, 56, 58, 59, 60, 61, 62, 64, 65, 66, 67, 71, 72, 73, 74, 76, 77, 79, 80, 82, 83, 84, 85, 86, 88, 89, 91, 92, 94, 95 (list; graph; listen)
OFFSET

1,2

EXAMPLE

8 is here because 2^8+1=257 is prime, so square-free. 9 is not here because 2^9+1=513 is divided by a square, 9.

CROSSREFS

Sequence in context: A039079 A047571 A070110 this_sequence A101742 A111688 A104248

Adjacent sequences: A049092 A049093 A049094 this_sequence A049096 A049097 A049098

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu)

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Last modified July 8 18:40 EDT 2008. Contains 141013 sequences.


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