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A107037 Indices of squarefree Jacobsthal numbers. 3
1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 19, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 37, 38, 39, 41, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 56, 57, 58, 59, 61, 62, 64, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 82, 83, 85, 86, 87, 88 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
MATHEMATICA
Rest[Flatten[Position[CoefficientList[Series[1/(1-x-2x^2), {x, 0, 100}], x], _?SquareFreeQ]]] (* Harvey P. Dale, May 27 2016 *)
CROSSREFS
Sequence in context: A302569 A235034 A331682 * A031994 A032897 A032856
KEYWORD
nonn
AUTHOR
Paul Barry, May 09 2005
EXTENSIONS
Offset corrected by Amiram Eldar, Feb 25 2024
STATUS
approved

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Last modified April 13 20:16 EDT 2024. Contains 371645 sequences. (Running on oeis4.)