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 A202136 Prefixing digits to Mersenne primes to obtain larger primes. 1
 13, 17, 131, 4127, 18191, 10131071, 1524287, 362147483647, 152305843009213693951, 58618970019642690137449562111, 57162259276829213363391578010288127, 55170141183460469231731687303715884105727 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The smallest prefixing digits for the Mersenne primes are given in A209385. - Gilbert Mozzo, Mar 07 2012 The next term a(13) has 160 decimal digits. - Andrew Howroyd, Nov 17 2018 LINKS Table of n, a(n) for n=1..12. Henri Lifchitz and Renaud Lifchitz, PRP Top Records FORMULA Mersenne prime + n*10^D with D = number of digits of the Mersenne prime. EXAMPLE For Mersenne4: -1 + 2^7 + 4*10^3 = 4127 which is prime. PROG (PARI) ppfx(n)={my(w=10^(1+logint(n, 10)), k=n+w); while(!ispseudoprime(k), k+=w); k} { for(n=1, 100, my(p=1<

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Last modified September 18 03:51 EDT 2024. Contains 375995 sequences. (Running on oeis4.)