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A156345 Nonprimes with the same number of even digits and prime digits. 0
0, 1, 9, 10, 12, 20, 21, 22, 34, 36, 38, 45, 54, 56, 58, 63, 65, 74, 76, 78, 85, 87, 90, 91, 92, 99, 100, 102, 110, 111, 112, 119, 120, 121, 122, 129, 134, 136, 138, 143, 145, 147, 154, 156, 158, 165, 174, 176, 178, 183, 185, 187, 190, 192, 200, 201, 202, 209, 210 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Even digits are 2, 4, 6 or 8. Prime digits are 2, 3, 5 or 7.

LINKS

Table of n, a(n) for n=1..59.

EXAMPLE

0(number=0), 1(number=0), 9(number=0), 10(number=0), 12(number=1), 20(number=1), 21(number=1), 22(number=2), 34(number=1), etc.

MATHEMATICA

okQ[n_]:=Module[{idn=IntegerDigits[n]}, !PrimeQ[n] && Count[idn, _?PrimeQ] == Count[idn, _?EvenQ]-Count[idn, 0]]; Select[Range[0, 250], okQ] (* Harvey P. Dale, Jan 12 2012 *)

CROSSREFS

Cf. A141468.

Sequence in context: A158581 A343258 A078459 * A078390 A216780 A279731

Adjacent sequences:  A156342 A156343 A156344 * A156346 A156347 A156348

KEYWORD

nonn,base,less

AUTHOR

Juri-Stepan Gerasimov, Feb 08 2009

EXTENSIONS

Removed 69, inserted 99 and 209 . R. J. Mathar, Feb 13 2009

STATUS

approved

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Last modified May 13 12:02 EDT 2021. Contains 343839 sequences. (Running on oeis4.)