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A261269
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Minimal prime concatenation sequence with base 2 and seed 11.
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3
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11, 111, 11101, 111011, 11101111, 111011111, 111011111001, 111011111001111, 1110111110011111, 11101111100111110101, 1110111110011111010101, 11101111100111110101010101, 11101111100111110101010101011, 1110111110011111010101010101111
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OFFSET
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1,1
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LINKS
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EXAMPLE
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In base 2, the least prime starting with seed 1 is 11; the least prime starting with 11 is 111; the least prime starting with 111 is 11101. Triangular format:
11
111
11101
111011
11101111
1110111111
111011111001
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MATHEMATICA
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b = 2; s = {{1}};
Do[NestWhile[# + 1 &, 0, ! (PrimeQ[FromDigits[tmp = Join[Last[s], (nn = #; IntegerDigits[nn - Sum[b^n, {n, l = NestWhile[# + 1 &, 1, ! (nn - (Sum[b^n, {n, #}]) < 0) &] - 1}], b, l + 1])], b]]) &];
AppendTo[s, tmp], {30}]; Map[FromDigits, s]
Map[FromDigits[#, b] &, s] (* A261270 *)
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CROSSREFS
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KEYWORD
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nonn,easy,base
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AUTHOR
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STATUS
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approved
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