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A133786
Numbers prime to 10, 10's digit is odd and 100's digit is odd.
1
111, 113, 117, 119, 131, 133, 137, 139, 151, 153, 157, 159, 171, 173, 177, 179, 191, 193, 197, 199, 311, 313, 317, 319, 331, 333, 337, 339, 351, 353, 357, 359, 371, 373, 377, 379, 391, 393, 397, 399, 511, 513, 517, 519, 531, 533, 537, 539, 551, 553, 557
OFFSET
1,1
LINKS
FORMULA
a(n+20)=a(n)+200. - Robert Israel, May 20 2019
MAPLE
seq(seq(seq(seq(10^3*a+10^2*b+10*c+d, d=[1, 3, 7, 9]), c=1..9, 2), b=1..9, 2), a=0..1); # Robert Israel, May 20 2019
CROSSREFS
Cf. A045798.
Sequence in context: A359651 A133794 A104155 * A211683 A326109 A338111
KEYWORD
easy,nonn,base
AUTHOR
Jonathan Vos Post, Jan 02 2008
STATUS
approved