

A036057


Friedman numbers: can be written in a nontrivial way using their digits and the operations +  * / ^ and concatenation of digits (but not of results).


13



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
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OFFSET

1,1


COMMENTS

Mitchell's and Wilson's lists both lack two terms, 16387 = (16/8)^(7)+3 and 41665 = 641*65.  Giovanni Resta, Dec 14 2013


LINKS

M. F. Hasler, Table of n, a(n) for n = 1..844 (data from E. Friedman's page as collected by K. Mitchell, completed by the two missing terms found by G. Resta).


FORMULA



EXAMPLE

E.g., 153=51*3, 736=3^6+7. Not 26 = 2 6 (concatenated), that's trivial.


CROSSREFS



KEYWORD

base,nonn


AUTHOR



EXTENSIONS



STATUS

approved



