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%I #8 Jan 20 2019 23:18:47
%S 1234,5678,9101,1121,3141,5161,7181,9202,1222,3242,5262,7282,9303,
%T 1323,3343,5363,7383,9404,1424,3444,5464,7484,9505,1525,3545,5565,
%U 7585,9606,1626,3646,5666,7686,9707,1727,3747,5767,7787,9808,1828,3848,5868,7888
%N Natural numbers written out with their digits grouped in sets of four (leading zeros omitted).
%H Rémy Sigrist, <a href="/A091332/b091332.txt">Table of n, a(n) for n = 1..10000</a>
%o (PARI) {c=0; d=[]; for(n=1, 99, while(#d<4, d=concat(d, digits(c++))); print1(sum(i=1,4,d[i]*10^(4-i))", "); d=vecextract(d, "^..4"))} \\ _M. F. Hasler_, Oct 23 2014
%Y Cf. A059805, A091331.
%K base,easy,nonn
%O 1,1
%A J. Taylor (integersfan(AT)yahoo.com), Mar 01 2004
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