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Search: id:A068989
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| A068989 |
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Squares which when reversed are primes (ignore leading zeros). |
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+0
2
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| 16, 196, 361, 784, 1024, 1369, 1444, 1600, 1681, 3844, 7225, 7921, 9025, 9409, 11236, 14161, 18496, 19321, 19600, 36100, 37249, 38416, 70756, 73441, 75076, 76729, 78400, 78961, 97969, 99856, 102400, 105625, 107584, 109561, 111556, 112225
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
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EXAMPLE
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1681 = 41^2 becomes 1861, a prime, when its digits are reversed.
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MATHEMATICA
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Do[s = i^2; If[PrimeQ[FromDigits[Reverse[IntegerDigits[s]]]], Print[s]], {i, 1, 10^2}]
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CROSSREFS
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Cf. primes whose reversal is a square, A007488; numbers n such that n^2 reversed is a prime, A059007.
Sequence in context: A153599 A016280 A077363 this_sequence A017318 A126981 A086940
Adjacent sequences: A068986 A068987 A068988 this_sequence A068990 A068991 A068992
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KEYWORD
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easy,nonn,base
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Mar 12 2002
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EXTENSIONS
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More terms from Zak Seidov (zakseidov(AT)yahoo.com), Jan 26 2005
Edited by N. J. A. Sloane (njas(AT)research.att.com), Dec 23 2007
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