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Search: id:A102607
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| A102607 |
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Numbers L such that 1LMN1 is prime, where M=L+1 and N=M+1. |
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+0
3
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| 3, 4, 5, 7, 12, 17, 24, 28, 33, 35, 37, 39, 40, 41, 50, 55, 58, 62, 66, 67, 75, 77, 79, 80, 90, 91, 97, 104, 109, 116, 125, 137, 141, 160, 174, 176, 186, 189, 195, 207, 211, 223, 227, 236, 241, 245, 257, 273, 277, 279, 288, 290, 297, 300, 304, 305, 313, 314, 333, 336
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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If L=3, then M=4 and N=5 and 13451 is prime.
If L=35, then M=36 and N=37 and 13536371 is prime.
If L=67, then M=68 and N=69 and 16768691 is prime.
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MATHEMATICA
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Select[Range[340], PrimeQ[FromDigits[Flatten[IntegerDigits /@ {1, #, # + 1, # + 2, 1}]]] &]
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CROSSREFS
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Cf. A102606, A102608.
Sequence in context: A092859 A120424 A139440 this_sequence A079463 A101759 A089560
Adjacent sequences: A102604 A102605 A102606 this_sequence A102608 A102609 A102610
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KEYWORD
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nonn,base
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Jan 29 2005
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jan 30 2005
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