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A108614
Semiprimes with non-semiprimes digits (no digits 4,6,9 in semiprimes).
1
10, 15, 21, 22, 25, 33, 35, 38, 51, 55, 57, 58, 77, 82, 85, 87, 111, 115, 118, 121, 122, 123, 133, 155, 158, 177, 178, 183, 185, 187, 201, 202, 203, 205, 213, 215, 217, 218, 221, 235, 237, 253, 278, 287, 301, 302, 303, 305, 321, 323, 327, 335, 355, 358, 371
OFFSET
1,1
COMMENTS
Complement of A107342 in the class of semiprimes.
This is to semiprimes A001358 as A034844 (Primes with nonprime digits) is to primes A000040. [Jonathan Vos Post, Jul 15 2010]
FORMULA
{j in A001358 and j not in A179463}. [Jonathan Vos Post, Jul 15 2010]
MATHEMATICA
cnd[n_]:=Plus@@Last/@FactorInteger[n]==2&&Union[FreeQ[IntegerDigits[n], # ]&/@{4, 6, 9}]=={True}; Select[Range[600], cnd[ # ]&]
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Zak Seidov, Jun 13 2005
STATUS
approved