The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #9 Jan 03 2025 23:29:15
%S 15538734736,28034367522,41221375552,89468493268,92220460962,
%T 95951017078,105627706800,108012908976,147689513538,161055865908,
%U 177073756566,181921823202,185137153012,192336309046,212463686778
%N Numbers m such that all ten numbers 10^k*m+1; k=0,1,...,9 are prime.
%C If m & n are in the sequence, k<10 and r=m*n*10^k -1 is prime then r has at least k+1 representations of the form p*q-(p+q)where p & q are prime.
%H Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_482.htm">Puzzle 482. Two Bergot questions</a>, The Prime Puzzles & Problems Connection.
%F a(n) >> n log^10 n. - _Charles R Greathouse IV_, Dec 29 2024
%Y Subsequence of A006093 and of A008596.
%Y Cf. A153431, A153433.
%K nonn,more
%O 1,1
%A _Farideh Firoozbakht_, Mar 31 2009