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A088935
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Numbers n such that leading digits of 2^n and 5^n are equal.
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1
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0, 5, 15, 78, 88, 98, 108, 118, 181, 191, 201, 211, 274, 284, 294, 304, 367, 377, 387, 397, 407, 470, 480, 490, 500, 563, 573, 583, 593, 603, 666, 676, 686, 696, 759, 769, 779, 789, 852, 862, 872, 882, 892, 955, 965, 975, 985
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| T. Sillke, Powers of 2 and 5 Puzzle
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EXAMPLE
| 78 is in the sequence since 2^78 = 302231454903657293676544 and 5^78 = 3308722450212110699485634768279851414263248443603515625
98 is in the sequence since 2^98 = 316912650057057350374175801344 and 5^98 = 315544362088404722164691426113114491869282574043609201908111572265625.
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MATHEMATICA
| Select[ Range[ 1000 ], IntegerDigits[ 2^# ][ [ 1 ] ] == IntegerDigits[ 5^# ][ [ 1 ] ] & ]
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CROSSREFS
| Cf. A088995.
Sequence in context: A149655 A032122 A064678 * A183937 A030487 A165470
Adjacent sequences: A088932 A088933 A088934 * A088936 A088937 A088938
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KEYWORD
| base,nonn
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AUTHOR
| Lekraj Beedassy (blekraj(AT)yahoo.com), Dec 01 2003
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EXTENSIONS
| Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 02 2003
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