A192261 Numbers n such that 4n+1 is a palindromic prime.

1, 25, 45, 78, 88, 93, 189, 199, 232, 2575, 2625, 2650, 3105, 3180, 3205, 3585, 3685, 4015, 4090, 4140, 4165, 4545, 4620, 7753, 7878, 8383, 8763, 8788, 8838, 8938, 9318, 9393, 9823, 17829, 17979, 18259, 18309, 18409, 18889, 19344, 19369, 19494, 19849, 19924

Offset

1,2

Links

Chai Wah Wu, Table of n, a(n) for n = 1..10000

Wikipedia, Pythagorean primes

Formula

{n such that A016813(n) is in A002385}. [Jonathan Vos Post, Jul 17 2011]

Mathematica

Select[Range[10000], PrimeQ[4#+1]&&PalindromeQ[4#+1]&] (* Harvey P. Dale, Jun 24 2023 *)

Prog

(PARI) is(n)=n==eval(concat(Vecrev(Str(n))))&&isprime(n);
for(n=1, 1e4, if(is(4*n+1), print1(n, ", "))) \\ Altug Alkan, Nov 04 2015

Crossrefs

Cf. A002385, A002144, A081220.

Sequence in context: A054520 A343826 A339958 * A038811 A028505 A367496

Adjacent sequences: A192258 A192259 A192260 * A192262 A192263 A192264

Keyword

nonn,base

Author

Matevz Markovic, Jul 02 2011

Extensions

Prior Mathematica program removed and more terms from Harvey P. Dale, Jun 24 2023

Status

approved