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Search: id:A102608
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| A102608 |
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Numbers L such that 1LM1 is prime and M=L+1. |
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+0
3
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| 2, 4, 11, 22, 25, 26, 28, 31, 32, 40, 44, 47, 52, 58, 70, 73, 79, 80, 86, 88, 89, 92, 1009, 1010, 1013, 1016, 1045, 1051, 1070, 1079, 1081, 1088, 1090, 1097, 1111, 1135, 1139, 1142, 1144, 1154, 1162, 1168, 1178, 1190, 1192, 1213, 1228, 1234, 1280, 1283, 1286
(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=2, then M=3 and 1231 is prime.
If L=40, then M=41 and 140411 is prime.
If L=88, then M=89 and 188891 is prime.
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MATHEMATICA
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Select[Range[1300], PrimeQ[FromDigits[Flatten[IntegerDigits /@ {1, #, # + 1, 1}]]] &]
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CROSSREFS
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Cf. A102606, A102607.
Sequence in context: A026275 A126972 A018774 this_sequence A018259 A018480 A004646
Adjacent sequences: A102605 A102606 A102607 this_sequence A102609 A102610 A102611
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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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