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A036057
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Friedman numbers: can be written in a nontrivial way using their digits and the operations + - * / ^ and concatenation of digits (but not of results).
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9
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25, 121, 125, 126, 127, 128, 153, 216, 289, 343, 347, 625, 688, 736, 1022, 1024, 1206, 1255, 1260, 1285, 1296, 1395, 1435, 1503, 1530, 1792, 1827, 2048, 2187, 2349, 2500, 2501, 2502, 2503, 2504, 2505, 2506, 2507, 2508, 2509, 2592, 2737, 2916, 3125, 3159
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Kerry Mitchell, Table of n, a(n) for n=1..842 [taken from Eric Friedman's page]
Erich Friedman, Friedman Numbers
Robert G. Wilson v, Table of n, a(n) with factorizations for n=1..844
Index entries for Four 4's problem
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EXAMPLE
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E.g. 153=51*3, 736=3^6+7. Not 26 = 2 6, that's trivial.
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CROSSREFS
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Cf. A080035, A156954, A046469.
Sequence in context: A126412 A078815 A206472 * A083509 A213445 A031151
Adjacent sequences: A036054 A036055 A036056 * A036058 A036059 A036060
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KEYWORD
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base,nonn
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AUTHOR
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Erich Friedman
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EXTENSIONS
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Corrected broken URL. Added cross-reference to A156954 R. J. Mathar, Feb 20 2009
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STATUS
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approved
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