A062016 Numbers with all odd digits which can be factored into two numbers > 1 with odd digits.

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

Offset

1,1

Links

Matthew House, Table of n, a(n) for n = 1..10000

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[d-1])
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))}:
sort(convert(R, list)); # Robert Israel, Nov 22 2016

Crossrefs

Sequence in context: A103508 A051246 A320062 * A108637 A091296 A107076

Adjacent sequences: A062013 A062014 A062015 * A062017 A062018 A062019

Keyword

nonn,base,easy

Author

Amarnath Murthy, Jun 01 2001

Extensions

More terms from Matthew Conroy, Jun 11 2001

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

Status

approved