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A141409
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Prime numbers that cannot be formed by the concatenation of previous terms.
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6
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2, 3, 5, 7, 11, 13, 17, 19, 29, 31, 41, 43, 47, 59, 61, 67, 71, 79, 83, 89, 97, 101, 103, 107, 109, 127, 131, 139, 149, 151, 157, 163, 167, 179, 181, 191, 199, 223, 227, 233, 239, 251, 263, 269, 277, 281, 307, 337, 349, 353, 373, 401, 409, 419, 421, 431, 439, 443, 449, 457, 461
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refs;
listen;
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OFFSET
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1,1
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COMMENTS
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Previous terms can appear in any order but can be used at most once. - Paolo P. Lava, Mar 04 2010
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LINKS
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EXAMPLE
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137 is not in the sequence because 13 || 7 -> 137;
797 is not in the sequence because 7 || 97 or 79 || 7 -> 797.
257 is not in the sequence because 2 || 5 || 7 = 257 where || denotes concatenation. - David A. Corneth, Jan 23 2022
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PROG
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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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EXTENSIONS
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STATUS
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approved
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