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

1,2

Links

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

Example

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

Mathematica

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

Crossrefs

Sequence in context: A362866 A084278 A286843 * A168671 A136197 A071620

Adjacent sequences: A069204 A069205 A069206 * A069208 A069209 A069210

Keyword

base,nonn

Author

Joseph L. Pe, Apr 10 2002

Status

approved