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Start with 1015 and repeatedly reverse the digits and add 4 to get the next term.
4

%I #9 Jul 23 2015 14:39:58

%S 1015,5105,5019,9109,9023,3213,3127,7217,7131,1321,1235,5325,5239,

%T 9329,9243,3433,3347,7437,7351,1541,1455,5545,5459,9549,9463,3653,

%U 3567,7657,7571,1761,1675,5765,5679,9769,9683,3873,3787,7877,7791,1981,1895,5985,5899,9989,9903,3103,3017,7107,7021,1211,1125,5215,5129,9219,9133,3323,3237,7327,7241,1431,1345,5435,5349,9439,9353,3543,3457,7547,7461,1651,1565,5655,5569,9659,9573,3763,3677,7767,7681,1871,1785,5875,5789,9879,9793,3983,3897,7987,7901,1101

%N Start with 1015 and repeatedly reverse the digits and add 4 to get the next term.

%H N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki.

%H <a href="/index/Rec#order_90">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1).

%F Has period 90. A full period is shown.

%t NestList[FromDigits[Reverse[IntegerDigits[#]]]+4&,1015,90] (* _Harvey P. Dale_, Jul 18 2015 *)

%Y Cf. A117830, A117828.

%K nonn,base

%O 1,1

%A _Klaus Brockhaus_, May 05 2006