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A287534 Composite numbers whose digits are restricted to 1, 3, 7, and 9. 0
9, 33, 39, 77, 91, 93, 99, 111, 113, 117, 119, 133, 171, 177, 319, 333, 339, 371, 377, 391, 393, 399, 711, 713, 717, 731, 737, 771, 777, 779, 791, 793, 799, 913, 917, 931, 933, 939, 973, 979, 993, 999 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..42.

MATHEMATICA

Select[Flatten@ Array[FromDigits /@ Tuples[{1, 3, 7, 9}, #] &, 3], CompositeQ] (* Michael De Vlieger, Jun 01 2017 *)

CROSSREFS

Cf. A091633, A136333.

Sequence in context: A208136 A130444 A177697 * A145849 A111045 A020226

Adjacent sequences:  A287531 A287532 A287533 * A287535 A287536 A287537

KEYWORD

nonn,base

AUTHOR

Luke Zieroth, May 26 2017

STATUS

approved

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Last modified September 24 10:18 EDT 2020. Contains 337317 sequences. (Running on oeis4.)