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A080608 Deletable primes: primes such that removing some digit leaves either the empty string or another deletable prime. 22
2, 3, 5, 7, 13, 17, 23, 29, 31, 37, 43, 47, 53, 59, 67, 71, 73, 79, 83, 97, 103, 107, 113, 127, 131, 137, 139, 157, 163, 167, 173, 179, 193, 197, 223, 229, 233, 239, 263, 269, 271, 283, 293, 307, 311, 313, 317, 331, 337, 347, 353, 359, 367, 373, 379, 383, 397, 431, 433, 439 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Subsequence of A179336. [Reinhard Zumkeller, Jul 11 2010]

LINKS

David W. Wilson, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Deletable Prime

MAPLE

read("transforms"):

isA080608 := proc(n)

    option remember;

    local dgs, i ;

    if isprime(n) then

        if n < 10 then

            true;

        else

            dgs := convert(n, base, 10) ;

            for i from 1 to nops(dgs) do

                subsop(i=NULL, dgs) ;

                digcatL(ListTools[Reverse](%)) ;

                if procname(%)  then

                    return true;

                end if;

            end do:

            false ;

        end if;

    else

        false;

    end if;

end proc:

n := 1;

for i from 1 to 500 do

    p := ithprime(i) ;

    if isA080608(p) then

        printf("%d %d\n", n, p) ;

        n := n+1 ;

    fi ;

end do: # R. J. Mathar, Oct 11 2014

CROSSREFS

Cf. A080603, A096235-A096246.

Sequence in context: A247980 A234851 A179336 * A137812 A216578 A094317

Adjacent sequences:  A080605 A080606 A080607 * A080609 A080610 A080611

KEYWORD

nonn,easy,base

AUTHOR

David W. Wilson, Feb 25 2003

STATUS

approved

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Last modified November 21 07:11 EST 2017. Contains 294996 sequences.