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%I #10 Jul 01 2022 10:10:58
%S 1221,221122,2112222112,1222211221122221,22112211222211222211221122,
%T 211222211222211221122221122112222112222112,
%U 12222112211222211221122221122221122112222112222112211222211221122221
%N Palindromes obtained as the concatenation of three successive terms of A091789.
%C a(13) with 1220 digits is the first term > 10^1000. - _Michael S. Branicky_, Jul 01 2022
%H Michael S. Branicky, <a href="/A091790/b091790.txt">Table of n, a(n) for n = 1..12</a>
%o (Python)
%o from itertools import count, islice
%o def agen():
%o s, t = "1", "2"
%o while True:
%o u = (s+t)[::-1]
%o yield int(s+t+u)
%o s, t = t, u
%o print(list(islice(agen(), 7))) # _Michael S. Branicky_, Jul 01 2022
%Y Cf. A091789.
%K base,nonn
%O 1,1
%A _Amarnath Murthy_, Feb 18 2004
%E More terms from _Max Alekseyev_, Sep 19 2009
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