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A062101 Squarefree numbers with every digit a squarefree number. 1
1, 2, 3, 5, 6, 7, 11, 13, 15, 17, 21, 22, 23, 26, 31, 33, 35, 37, 51, 53, 55, 57, 61, 62, 65, 66, 67, 71, 73, 77, 111, 113, 115, 122, 123, 127, 131, 133, 137, 151, 155, 157, 161, 163, 165, 166, 167, 173, 177, 211, 213, 215, 217, 221, 222, 223, 226, 227, 231, 233 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..5000

EXAMPLE

a(9) = 15 is a squarefree number, 1 and 5 are also squarefree numbers.

MATHEMATICA

With[{sf={1, 2, 3, 5, 6, 7}}, Flatten[Table[Select[FromDigits/@ Tuples[ sf, n], SquareFreeQ], {n, 3}]]]  (* Harvey P. Dale, Aug 09 2014 *)

CROSSREFS

Sequence in context: A260442 A098962 A073485 * A283599 A096530 A299157

Adjacent sequences:  A062098 A062099 A062100 * A062102 A062103 A062104

KEYWORD

nonn,base,easy

AUTHOR

Amarnath Murthy, Jun 16 2001

EXTENSIONS

More terms from Reiner Martin (reinermartin(AT)hotmail.com), Jul 20 2001

STATUS

approved

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Last modified August 20 10:05 EDT 2019. Contains 326149 sequences. (Running on oeis4.)