A069207 Numbers n such that n^2 + (reversal of n)^2 is prime. Ignore leading 0's.

1, 10, 14, 23, 25, 32, 41, 52, 58, 85, 104, 116, 124, 164, 170, 190, 194, 205, 227, 233, 283, 310, 320, 328, 332, 380, 382, 398, 401, 409, 419, 421, 425, 461, 491, 499, 502, 508, 518, 524, 598, 611, 689, 710, 722, 728, 758, 778, 805, 815, 823, 827, 857, 877

Offset: 1

Author

Joseph L. Pe, Apr 10 2002

Keywords

• base
• nonn

Examples

			14^2 + 41^2 = 1877, a prime, so 14 belongs to the sequence.
		

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Programs

Mathematica

Select[Range[10^3], PrimeQ[ #^2 + FromDigits[Reverse[IntegerDigits[ # ]]]^2] &]