|
|
A179293
|
|
Primes of the form (10p)^2 + 1, where p is also prime.
|
|
1
|
|
|
401, 12101, 16901, 28901, 52901, 184901, 220901, 792101, 1020101, 1144901, 2464901, 3204101, 3648101, 3880901, 3960101, 5428901, 6604901, 7672901, 9672101, 12180101, 12460901, 13468901, 13912901, 14364101, 15132101, 18576101
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
Sequence is a subset of primes of the form n^2 + 1.
|
|
LINKS
|
|
|
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
|
|
|
|