A072367 Squares x such that x + reverse of x is a prime.
1, 100, 196, 625, 10816, 13456, 15376, 18496, 21025, 22201, 22801, 24649, 25921, 27889, 29929, 33856, 35344, 36100, 42025, 50176, 60025, 63001, 70756, 71824, 73984, 78400, 82369, 83521, 96100, 1012036, 1048576, 1073296, 1123600, 1144900
Offset: 1
Examples
196 is a term because 196 is a square and 196+691=887 is a prime.
Links
- Robert Israel, Table of n, a(n) for n = 1..10000
Programs
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Magma
[k:k in [m^2:m in [1..1100]]| IsPrime(Seqint(Intseq(k,10))+Seqint(Reverse(Intseq(k,10))))]; // Marius A. Burtea, Jun 20 2019
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Maple
select(t -> isprime(t+revdigs(t)), [seq(i^2,i=1..10000)]); # Robert Israel, Jun 19 2019
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Mathematica
Select[Range[1100]^2,PrimeQ[#+FromDigits[Reverse[IntegerDigits[#]]]]&] (* Harvey P. Dale, Feb 20 2011 *)
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PARI
isok(x) = issquare(x) && isprime(x+fromdigits(Vecrev(digits(x)))); \\ Michel Marcus, Jun 19 2019