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A116935
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Semiprimes (A001358) which are the concatenation of the numbers 1 through n for some n.
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2
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OFFSET
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1,1
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COMMENTS
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Next term has 185 digits, and it is thus too large to be included. It is equal to the concatenation of the first 97 integers. - Giovanni Resta, Jun 15 2016
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LINKS
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FORMULA
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EXAMPLE
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a(1) = 123 = 3 * 41.
a(2) = 1234 = 2 * 617.
a(3) = 1234567 = 127 * 9721.
a(4) = 2 * 6172839455055606570758085909601061116212631364146515661667.
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CROSSREFS
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KEYWORD
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base,nonn,less
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AUTHOR
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STATUS
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approved
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