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A049093 2^n - 1 is squarefree. 3
1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 19, 22, 23, 25, 26, 27, 28, 29, 31, 32, 33, 34, 35, 37, 38, 39, 41, 43, 44, 45, 46, 47, 49, 50, 51, 52, 53, 55, 56, 57, 58, 59, 61, 62, 64, 65, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 79, 81, 82, 83, 85, 86, 87, 88, 89, 91, 92 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

EXAMPLE

a[ 7 ]=8 because 2^8-1=255=5*3*17 is squarefree

CROSSREFS

Sequence in context: A136447 A005100 A051772 * A098901 A098767 A153381

Adjacent sequences:  A049090 A049091 A049092 * A049094 A049095 A049096

KEYWORD

nonn

AUTHOR

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

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Last modified February 16 02:51 EST 2012. Contains 205860 sequences.