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A054565
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Numbers n such that 3 is the first digit of 3^n.
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3
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1, 18, 20, 22, 41, 43, 62, 64, 66, 83, 85, 87, 106, 108, 110, 127, 129, 131, 150, 152, 171, 173, 175, 194, 196, 215, 217, 219, 236, 238, 240, 259, 261, 263, 280, 282, 284, 303, 305, 324, 326, 328, 347, 349, 368, 370, 372, 389, 391, 393, 412, 414, 416, 433
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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Select[Range[500], First[IntegerDigits[3^#]]==3&] (* Harvey P. Dale, Dec 23 2012 *)
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PROG
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(PARI) for(n=1, 100, if(floor(3^n/10^(floor(n*log(3)/log(10))))==3, print1(n, ", ")))
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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