OFFSET
1,2
EXAMPLE
a(1)=1 because
prime(1)*6 - 5 = 7,
prime(1)*6 - 1 = 11,
prime(1)*6 + 1 = 13, and
prime(1)*6 + 5 = 17
are all prime.
MAPLE
isA174393 := proc(n) local p ; p := ithprime(n) ; isprime(p*6-1) and isprime(p*6-5) and isprime(p*6+1) and isprime(p*6+5); end proc: for n from 1 to 40000 do if isA174393(n) then printf("%d, ", n) ; end if; end do: # R. J. Mathar, Mar 29 2010
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Mar 18 2010
EXTENSIONS
Corrected and extended by Charles R Greathouse IV, Mar 18 2010
STATUS
approved