A108632 Semiprimes with prime digits (only digits 2,3,5,7 in semiprimes).

22, 25, 33, 35, 55, 57, 77, 235, 237, 253, 323, 327, 335, 355, 377, 527, 533, 535, 537, 553, 573, 723, 737, 753, 755, 2227, 2253, 2257, 2323, 2327, 2335, 2353, 2533, 2537, 2573, 2577, 2722, 2723, 2733, 2735, 2757, 2773, 3223, 3227, 3233, 3235, 3273, 3277

Offset

1,1

Comments

Complement of 108631 in the class of semiprimes.

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Mathematica

fQ[n_]:=Plus@@Last/@FactorInteger[n]==2&&Union[{2, 3, 5, 7}, IntegerDigits[n]]=={2, 3, 5, 7}; Select[Range[4000], fQ[ # ]&]
Select[FromDigits/@Flatten[Table[Tuples[{2, 3, 5, 7}, n], {n, 2, 4}], 1], PrimeOmega[#]==2&] (* Harvey P. Dale, Oct 19 2012 *)

Crossrefs

Cf. A108631.

Sequence in context: A338603 A322124 A178423 * A045096 A227408 A303304

Adjacent sequences: A108629 A108630 A108631 * A108633 A108634 A108635

Keyword

nonn,base

Author

Zak Seidov, Jun 13 2005

Status

approved