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A261164
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List run lengths of digits different from '4', when all terms are concatenated. Lexicographically first such sequence of nonnegative numbers with no repeated terms.
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2
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1, 4, 0, 2, 3, 5, 44, 6, 7, 40, 8, 9, 41, 10, 11, 42, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 14, 36, 37, 38, 43, 39, 50, 51, 45, 52, 53, 55, 56, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71, 72, 24, 73, 75, 76, 77, 46, 78, 79, 80, 81, 47, 82
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OFFSET
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1,2
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COMMENTS
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LINKS
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PROG
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(PARI) A261164(n=99, d=4, a=1, p=0, u=[-1], r=u)={for(n=2, n, print1(a", "); p+=#digits(a)+!a; r=concat(r, r[#r]+a+1); while(#r>1&&r[1]<p, r=r[2..-1]); u=setunion(u, [a]); while(#u>1&&u[2]==u[1]+1, u=u[2..-1]); for(k=u[1]+1, 9e9, setsearch(u, k)&&next; if(r[1] >= p+#dk=if(k, digits(k), [0]), setsearch(Set(dk), d)&&next, for(i=1, #dk, (dk[i]==d)==!setsearch(r, p+i-1)&&next(2))); a=k; next(2)); error); a}
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CROSSREFS
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Cf. A261160 - A261169 for the variants that use digit '0', ..., '9' as delimiter.
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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