The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A107665 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A107665

Numbers with semiprime digits (digits 4, 6, 9 only).
(history; published version)

#8 by Harvey P. Dale at Tue Oct 21 09:48:01 EDT 2014

STATUS

editing

approved

#7 by Harvey P. Dale at Tue Oct 21 09:47:55 EDT 2014

MATHEMATICA

Flatten[Table[FromDigits/@Tuples[{4, 6, 9}, n], {n, 4}]] (* Harvey P. Dale, Oct 21 2014 *)

STATUS

approved

editing

#6 by Charles R Greathouse IV at Thu Nov 21 12:48:42 EST 2013

MATHEMATICA

Select[Range[5000], Union[Pick[DigitCount[#], {1, 1, 1, 0, 1, 0, 1, 1, 0, 1}, 1]] == {0}&] (* From _Harvey P. Dale, _, Oct 21 2011 *)

Discussion

Thu Nov 21

12:48

OEIS Server: https://oeis.org/edit/global/2062

#5 by Russ Cox at Fri Mar 30 17:36:43 EDT 2012

AUTHOR

_Rick L. Shepherd (rshepherd2(AT)hotmail.com), _, May 19 2005

Discussion

Fri Mar 30

17:36

OEIS Server: https://oeis.org/edit/global/176

#4 by Harvey P. Dale at Fri Oct 21 13:13:21 EDT 2011

STATUS

editing

approved

#3 by Harvey P. Dale at Fri Oct 21 13:13:07 EDT 2011

MATHEMATICA

Select[Range[5000], Union[Pick[DigitCount[#], {1, 1, 1, 0, 1, 0, 1, 1, 0, 1}, 1]] == {0}&] (* From Harvey P. Dale, Oct 21 2011 *)

STATUS

approved

editing

#2 by N. J. A. Sloane at Tue Jan 24 03:00:00 EST 2006

NAME

Numbers whose digits are all with semiprime digits (digits 4, 6, 9 only).

CROSSREFS

Cf. A107342, A111494, A111496, A111697.

KEYWORD

base,nonn,new

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

NAME

Numbers whose digits are all semiprime (digits 4, 6, 9 only).

DATA

4, 6, 9, 44, 46, 49, 64, 66, 69, 94, 96, 99, 444, 446, 449, 464, 466, 469, 494, 496, 499, 644, 646, 649, 664, 666, 669, 694, 696, 699, 944, 946, 949, 964, 966, 969, 994, 996, 999, 4444, 4446, 4449, 4464, 4466, 4469, 4494, 4496, 4499, 4644, 4646, 4649, 4664

OFFSET

1,1

CROSSREFS

Cf. A107666 (primes in this sequence), A001358 (semiprimes), A029581 (all digits are composite).

KEYWORD

base,nonn

AUTHOR

Rick L. Shepherd (rshepherd2(AT)hotmail.com), May 19 2005

STATUS

approved