The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A108637 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A108637

Duplicate of A091296.
(history; published version)

#3 by N. J. A. Sloane at Fri May 11 03:00:00 EDT 2007

NAME

Semiprimes with odd digitsDuplicate of A091296.

DATA

9, 15, 33, 35, 39, 51, 55, 57, 77, 91, 93, 95, 111, 115, 119, 133, 155, 159, 177, 319, 335, 339, 355, 371, 377, 391, 393, 395, 511, 515, 517, 519, 533, 535, 537, 551, 553, 559, 573, 579, 591, 597, 713, 717, 731, 737, 753, 755, 771, 779, 791, 793, 799, 913, 917

COMMENTS

Semiprimes with odd digits are more numerous than ones with even digits, cf. A108636.

MATHEMATICA

Select[Range[1000], Plus@@Last/@FactorInteger[ # ]==2&&Union[OddQ/@IntegerDigits[ # ]]=={True}&]

CROSSREFS

Cf. A108636.

KEYWORD

nonn,base,new

dead

AUTHOR

Zak Seidov (zakseidov(AT)yahoo.com), Jun 14 2005

#2 by N. J. A. Sloane at Fri Feb 24 03:00:00 EST 2006

MATHEMATICA

Select[Range[1000], Plus@@Last/@FactorInteger[ # ]==2&&Union[OddQ/@IntegerDigits[ # ]]=={True}&]

KEYWORD

nonn,base,new

#1 by N. J. A. Sloane at Tue Jul 19 03:00:00 EDT 2005

NAME

Semiprimes with odd digits.

DATA

OFFSET

1,1

COMMENTS

Semiprimes with odd digits are more numerous than ones with even digits, cf. A108636.

MATHEMATICA

Select[Range[1000], Plus@@Last/@FactorInteger[ # ]==2&&Union[OddQ/@IntegerDigits[ # ]]=={True}&]

CROSSREFS

Cf. A108636.

KEYWORD

nonn,base

AUTHOR

Zak Seidov (zakseidov(AT)yahoo.com), Jun 14 2005

STATUS

approved