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A087380 Let Pricom(n) be defined as the number obtained by replacing each prime digit (2,3,5,7) of n with a '0' and a composite digit (0,4,6,8,9) with a '1' . A 1 remains the same. a(n) = Pricom(n). 1
1, 0, 0, 1, 0, 1, 0, 1, 1, 11, 11, 10, 10, 11, 10, 11, 10, 11, 11, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 11, 11, 10, 10, 11, 10, 11, 10, 11, 11, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 11, 11, 10, 10, 11, 10, 11, 10, 11, 11, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 11, 11, 10, 10, 11, 10, 11, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,10

COMMENTS

For all numbers using only prime digits a(n) = 0. For a 'k' digit number using 1 and/or only composite digits a(n) = (10^k-1)/9.

LINKS

Table of n, a(n) for n=1..87.

EXAMPLE

a(4206) = 1011

a(10235479) = 11000101.

CROSSREFS

Cf. A087381.

Sequence in context: A300289 A321108 A126610 * A152986 A252838 A212541

Adjacent sequences:  A087377 A087378 A087379 * A087381 A087382 A087383

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Sep 09 2003

EXTENSIONS

More terms from David Wasserman, May 25 2005

STATUS

approved

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Last modified November 13 23:01 EST 2019. Contains 329106 sequences. (Running on oeis4.)