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Search: id:A088619
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| A088619 |
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Numbers n such that the concatenation of 1, n and n^2 is prime. |
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+0
3
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| 3, 11, 21, 29, 39, 47, 59, 69, 101, 111, 131, 149, 171, 183, 197, 213, 231, 243, 249, 251, 297, 299, 317, 323, 329, 369, 387, 401, 411, 423, 431, 461, 501, 521, 527, 533, 537, 539, 543, 593, 651, 657, 669, 717, 741, 743, 779, 819, 867, 869, 873, 897, 939, 981
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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3 is a member as 139 is a prime. 11 is a member as 111121 (concatenation of 1,11 and 121) is prime.
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MATHEMATICA
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Select[ Range[1000], PrimeQ[ FromDigits[ Join[ IntegerDigits[ #^0], IntegerDigits[ # ], IntegerDigits[ #^2]]]] &]
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CROSSREFS
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Cf. A068702.
Sequence in context: A139221 A006876 A031239 this_sequence A031318 A082485 A064568
Adjacent sequences: A088616 A088617 A088618 this_sequence A088620 A088621 A088622
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Oct 17 2003
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com) and Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 18 2003
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