OFFSET
1,1
COMMENTS
Corresponding values of 10*m + 1 are in A179444.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..1000
PROG
(PARI) is(n)={n>1 && !isprime(n) && !isprime(10*n+1)}
select(is, [1..200]) \\ Andrew Howroyd, Jan 04 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Jul 14 2010
EXTENSIONS
Terms a(43) and beyond from Andrew Howroyd, Jan 04 2020
STATUS
approved