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Search: id:A090155
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| A090155 |
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Primes of the form identical digits preceded by a 7. |
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+0
2
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| 7, 71, 73, 79, 733, 7333, 79999, 733333, 799999, 71111111, 799999999, 79999999999, 79999999999999999999999999, 79999999999999999999999999999999999999999999999999
(list; graph; listen)
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OFFSET
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1,1
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MATHEMATICA
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Select[ FromDigits /@ Flatten[ Table[ PadRight[{7}, i, # ] & /@ {1, 2, 3, 4, 5, 6, 7, 8, 9}, {i, 2, 50}], 1], PrimeQ[ # ] &]
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CROSSREFS
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Adjacent sequences: A090152 A090153 A090154 this_sequence A090156 A090157 A090158
Sequence in context: A090647 A111462 A045713 this_sequence A107163 A142037 A087390
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KEYWORD
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nonn,base
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 22 2003
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