OFFSET
1,1
COMMENTS
2004 has this property, i.e., 2004 = 2^2*3*167, the three numbers 2*2004-1,3*2004-1 and 167*2004-1 are primes. But 2004 is not in the sequence because 2004 is not the smallest number with such property.
LINKS
Carlos Rivera, Puzzle 334. Farideh & the 2004 year, The Prime Puzzles & Problems connection.
EXAMPLE
a(7) = 55137810 because 55137810 = 2*3*5*7*13*19*1063 and all the seven numbers 2*55137810-1, 3*55137810-1, 5*55137810-1, 7*55137810-1, 13*55137810-1, 19*55137810-1 and 1063*55137810-1 are prime numbers and 55137810 is the smallest number m with such property.
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Farideh Firoozbakht, Feb 18 2004
EXTENSIONS
a(10) from Michael S. Branicky, Feb 25 2023
a(11) from Michael S. Branicky, Mar 20 2023
STATUS
approved