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A202136
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Prefixing digits to Mersenne primes to obtain larger primes.
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1
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OFFSET
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1,1
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COMMENTS
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The smallest prefixing digits for the 30 first successive Mersenne primes are given in A209385. - Gilbert Mozzo, Mar 07 2012
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LINKS
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Table of n, a(n) for n=1..9.
Henri Lifchitz and Renaud Lifchitz, PRP Top Records
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FORMULA
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Mersenne prime+n*10^D with D=number of digits of the Mersenne prime.
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EXAMPLE
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For Mersenne4: -1+2^7+4*10^3 = 4127 which is prime.
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PROG
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PARI : for(n=0, 1e4, if(ispseudoprime(p=-1+2^7+n*10^3), print(p", "))); for the above example related to Mersenne4.
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CROSSREFS
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Cf. A209385.
Sequence in context: A069853 A175791 A210547 * A123909 A176555 A131019
Adjacent sequences: A202133 A202134 A202135 * A202137 A202138 A202139
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KEYWORD
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nonn,base
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AUTHOR
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Gilbert Mozzo, Dec 12 2011
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EXTENSIONS
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Three more terms added by Gilbert Mozzo, Mar 07 2012
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STATUS
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approved
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