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%I #11 Jun 14 2023 10:33:58
%S 0,18,28,38,79,81,83,85,97,102,122,132,142,152,162,172,182,192,208,
%T 228,238,248,258,268,278,288,298,308,328,338,348,358,368,378,388,398,
%U 799,801,803,805,809,812,821,823,825,829,831,833,835,839,841,843,845,849
%N Numbers k such that the last letter of k is the same as the first letter of k+1 when written in English.
%D GCHQ, The GCHQ Puzzle Book, Penguin, 2016. See Puzzle 31, page 37.
%H Michael S. Branicky, <a href="/A363659/b363659.txt">Table of n, a(n) for n = 1..10000</a>
%o (Python)
%o from num2words import num2words as n2w
%o def ok(n): return n2w(n)[-1] == n2w(n+1)[0]
%o print([k for k in range(850) if ok(k)]) # _Michael S. Branicky_, Jun 14 2023
%K nonn,word
%O 1,2
%A _Sean A. Irvine_, Jun 14 2023
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