OFFSET
1,1
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
FORMULA
a(n) ~ 0.4n log n.
EXAMPLE
n=2: 269 is prime.
n=49: 4969 is prime.
n=97: 9769 is prime.
MAPLE
filter:= proc(n) isprime(100*n+69) end proc:
select(filter, [$1..300]); # Robert Israel, Sep 30 2018
PROG
(Magma) [ n: n in [1..300] | IsPrime(Seqint([9, 6] cat Intseq(n))) ];
(PARI) is(n)=isprime(100*n+69) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Parthasarathy Nambi, Mar 30 2005
STATUS
approved