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A090721
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Primes whose representation in base 1024 can be interpreted as a decimal prime.
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56
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2, 3, 5, 7, 1031, 1033, 3079, 4099, 6151, 7177, 1048583, 1049603, 1050631, 1051649, 1053697, 1054723, 2099203, 2100227, 2101249, 2102273, 2102279, 2105347, 3148801, 3148807, 3149831, 3150857, 3151879, 3153923, 3153929, 4198409, 4200451, 5242883
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OFFSET
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1,1
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LINKS
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PROG
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(PARI) is(n)=if(!isprime(n), return(0)); my(s, t, b=1); while(n, t=n%1024; if(t>9, return(0)); s+=t*b; b*=10; n>>=10); s \\ Charles R Greathouse IV, Feb 07 2013
(PARI) v=List(); forprime(p=2, 1e3, d=digits(p); t=sum(i=1, #d, d[i]<<(10*(#d-i))); if(ispseudoprime(t), listput(v, t))); Vec(v) \\ Charles R Greathouse IV, Feb 07 2013
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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Better definition and offset by Omar E. Pol, Dec 24 2008
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STATUS
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approved
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