A179293 - OEIS

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A179293

Primes of the form (10p)^2 + 1, where p is also prime.

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

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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

Sequence in context: A102324 A156785 A031628 * A097742 A115244 A031518

Adjacent sequences: A179290 A179291 A179292 * A179294 A179295 A179296

KEYWORD

easy,nonn

AUTHOR

Kevin Batista (kevin762401(AT)yahoo.com), Jul 09 2010

STATUS

approved