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Search: id:A102249
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| A102249 |
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Numbers n such that n1111 is prime. |
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+0
2
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| 10, 13, 31, 36, 51, 57, 61, 69, 72, 78, 79, 90, 91, 97, 117, 120, 127, 129, 135, 138, 153, 156, 166, 174, 183, 184, 189, 201, 205, 210, 222, 225, 226, 234, 237, 240, 241, 244, 252, 261, 265, 273, 276, 280, 285, 292, 304, 306, 309, 318, 322, 325, 327, 337, 345
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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If n=10, then n1111 = 101111 (prime).
If n=90, then n1111 = 901111 (prime).
If n=138, then n1111 = 1381111 (prime).
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MATHEMATICA
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Select[ Range[ 350], PrimeQ[ FromDigits[ Flatten[ IntegerDigits /@ { #, 1, 1, 1, 1}]]] &] (from Robert G. Wilson v Feb 21 2005)
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CROSSREFS
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Cf. A024912.
Sequence in context: A111524 A074346 A126973 this_sequence A062370 A069960 A108761
Adjacent sequences: A102246 A102247 A102248 this_sequence A102250 A102251 A102252
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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), Feb 18 2005
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 21 2005
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