# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a036057 Showing 1-1 of 1 %I A036057 #36 Aug 13 2020 14:01:06 %S A036057 25,121,125,126,127,128,153,216,289,343,347,625,688,736,1022,1024, %T A036057 1206,1255,1260,1285,1296,1395,1435,1503,1530,1792,1827,2048,2187, %U A036057 2349,2500,2501,2502,2503,2504,2505,2506,2507,2508,2509,2592,2737,2916,3125,3159 %N A036057 Friedman numbers: can be written in a nontrivial way using their digits and the operations + - * / ^ and concatenation of digits (but not of results). %C A036057 Mitchell's and Wilson's lists both lack two terms, 16387 = (1-6/8)^(-7)+3 and 41665 = 641*65. - _Giovanni Resta_, Dec 14 2013 %C A036057 Primes in this sequence are listed in A112419. See also the subsequence A080035 of "orderly" terms, and its subset A156954. - _M. F. Hasler_, Jan 04 2015 %H A036057 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). %H A036057 M. Brand, Friedman numbers have density 1, Discrete Applied Mathematics, Volume 161, Issues 16-17, November 2013, Pages 2389-2395. %H A036057 Ed Copeland and Brady Haran, Friedman numbers, Numberphile video, 2014 %H A036057 Erich Friedman, Friedman Numbers %H A036057 Giovanni Resta, Friedman numbers Friedman numbers and expressions up to 10^6 %H A036057 Robert G. Wilson v, Table of n, a(n) with factorizations for n=1..844 %H A036057 Index entries for Four 4's problem %F A036057 a(n) ~ n, see Brand. - _Charles R Greathouse IV_, Jun 04 2013 %e A036057 E.g., 153=51*3, 736=3^6+7. Not 26 = 2 6 (concatenated), that's trivial. %Y A036057 Cf. A080035, A156954, A046469. %K A036057 base,nonn %O A036057 1,1 %A A036057 _Erich Friedman_ %E A036057 Edited by _Michel Marcus_ and _M. F. Hasler_, Jan 04 2015 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE