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A069207 Numbers n such that n^2 + (reversal of n)^2 is prime. Ignore leading 0's. +0
1
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 (list; graph; listen)
OFFSET

1,2

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: A151740 A136802 A084278 this_sequence A136197 A071620 A053690

Adjacent sequences: A069204 A069205 A069206 this_sequence A069208 A069209 A069210

KEYWORD

base,nonn

AUTHOR

Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Apr 10 2002

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.


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