A177948 Numbers n such that n^2 + reverse of n^2 is a prime.

1, 10, 14, 25, 104, 116, 124, 136, 145, 149, 151, 157, 161, 167, 173, 184, 188, 190, 205, 224, 245, 251, 266, 268, 272, 280, 287, 289, 310, 1006, 1024, 1036, 1060, 1070, 1124, 1150, 1216, 1220, 1240, 1244, 1250, 1286, 1306, 1310, 1336, 1366, 1376, 1406, 1417

Offset

1,2

Links

Table of n, a(n) for n=1..49.

Example

116 is in the sequence, because 116^2 = 13456, and 13456 + 65431 = 78887 is a prime.

Mathematica

Select[Range[2000], PrimeQ[(#)^2 + FromDigits[Reverse[IntegerDigits[(#)^2]]]] &]

Crossrefs

Cf. A000040, A072366.

Sequence in context: A071620 A175664 A053690 * A176140 A031028 A176810

Adjacent sequences: A177945 A177946 A177947 * A177949 A177950 A177951

Keyword

nonn,base

Author

Michel Lagneau, May 15 2010

Status

approved