

A062016


Numbers with all odd digits which can be factored into two numbers > 1 with odd digits.


2



9, 15, 33, 35, 39, 51, 55, 57, 75, 77, 91, 93, 95, 99, 111, 117, 119, 133, 135, 153, 155, 159, 171, 175, 177, 195, 315, 333, 339, 351, 355, 357, 371, 375, 393, 395, 399, 511, 513, 519, 531, 537, 539, 553, 555, 573, 575, 579, 591, 595, 597, 711, 715, 755, 775, 777, 791, 795, 917, 931, 933, 935, 939, 951, 955, 957, 959, 973, 975
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OFFSET

1,1


LINKS



EXAMPLE

95 = 19*5 is OK but 115 = 23*5 and 17*5 = 85 are not.


MAPLE

dmax:= 4: # to get all terms of up to dmax digits
S[1]:= [1, 3, 5, 7, 9]:
for d from 2 to dmax do
S[d]:= map(t > seq(10*t+j, j=1..9, 2), S[d1])
od:
T:= {seq(op(S[i]), i=1..dmax)} minus {1}:
R:= T intersect {seq(seq(T[i]*T[j], j=1..i), i=1..nops(T))}:


CROSSREFS



KEYWORD

nonn,base,easy


AUTHOR



EXTENSIONS

Offset corrected by and more terms from Matthew House, Nov 22 2016


STATUS

approved



