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A135119 Integers n such that 10^n+57 is a prime number. 1

%I #22 Apr 23 2022 19:08:35

%S 1,2,5,11,22,30,31,43,44,64,107,191,2149,3174,4952,12126,29884,32645,

%T 48442,60959,62750,87408,95326

%N Integers n such that 10^n+57 is a prime number.

%C See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10057".

%C No additional terms <100000.

%H Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/">List of near-repdigit-related prime numbers</a>.

%H <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>.

%e 5 is a member because 10^5+57 = 100000+57 = 100057, which is a prime number.

%Y Cf. A095688, A108052, A108050, A108312, A107083, A108049, A108054.

%K more,nonn

%O 1,2

%A Julien Peter Benney (jpbenney(AT)gmail.com), Feb 12 2008

%E Four PRP terms from _Sean A. Irvine_, Nov 11 2009

%E Added term 60959. _Robert Price_, Mar 22 2010

%E Added terms 29884,32645. _Robert Price_, Aug 24 2010

%E Edited by _Ray Chandler_, Dec 23 2010

%E a(19)=48442 from _Robert Price_, Dec 31 2010

%E a(21)=62750 from _Robert Price_, Jan 29 2011

%E a(22)=87408 from _Robert Price_, Mar 03 2011

%E a(23)=95326 from _Robert Price_, Mar 24 2011

%E Deleted superseded comment. - _Harvey P. Dale_, Apr 23 2022

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Last modified April 25 07:53 EDT 2024. Contains 371964 sequences. (Running on oeis4.)