OFFSET
1,1
COMMENTS
Sequence is a subset of primes of the form n^2 + 1.
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
(prime(14)*10)^2 + 1 = (43*10)^2 + 1 = 184901, which is prime.
MATHEMATICA
Select[Table[(10p)^2+1, {p, Prime[Range[100]]}], PrimeQ] (* Harvey P. Dale, May 20 2018 *)
PROG
(Magma) [a: p in PrimesUpTo(25000)|IsPrime(a) where a is (10*p)^2+1] // Vincenzo Librandi, Dec 22 2010
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Kevin Batista (kevin762401(AT)yahoo.com), Jul 09 2010
STATUS
approved