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A108844 Primes such that the outer 2 digits are n and all inner digits are 7, where 0 < n < 9. +0
1
373, 1777771, 377777777777773, 1777777777777777777777777777777777777777777777771, 3777777777777777777777777777777777777777777777777777773 (list; graph; listen)
OFFSET

1,1

COMMENT

These primes are palindromic.

PROGRAM

(PARI) n10np1(n, d) = { local(x, y, k); for(x=1, n, for(k=1, 8, y=10^(x+1)*k+floor(10^x*d/9)*10+k; if(isprime(y), print1(y", ")) ) ) }

CROSSREFS

Sequence in context: A133559 A023313 A134161 this_sequence A025336 A025328 A045284

Adjacent sequences: A108841 A108842 A108843 this_sequence A108845 A108846 A108847

KEYWORD

easy,nonn,base

AUTHOR

Cino Hilliard (hillcino368(AT)gmail.com), Jul 11 2005

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Last modified July 23 17:35 EDT 2008. Contains 142285 sequences.


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