login
A069207
Numbers n such that n^2 + (reversal of n)^2 is prime. Ignore leading 0's.
2
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
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
KEYWORD
base,nonn
AUTHOR
Joseph L. Pe, Apr 10 2002
STATUS
approved