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A107976
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First differences give the same sequence written as a string of individual digits.
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6
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7, 14, 15, 19, 20, 25, 26, 35, 37, 37, 39, 44, 46, 52, 55, 60, 63, 70, 73, 80, 83, 92, 96, 100, 104, 110, 115, 117, 122, 127, 133, 133, 139, 142, 149, 149, 156, 159, 167, 167, 175, 178, 187, 189, 198, 204, 205, 205, 205, 206, 206, 210, 211, 212, 212, 213, 214
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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7.14.15.19.20.25.26.35.37.37... <- sequence
.7..1..4..1..5..1..9..2..0... <- first differences = the sequence's digits
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MATHEMATICA
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a[1] = 7; a[n_] := a[n] = a[n - 1] + Flatten[ Table[ IntegerDigits[ a[i]], {i, n - 1}]][[n - 1]]; Table[ a[n], {n, 60}] (* Robert G. Wilson v, Jun 15 2005 *)
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CROSSREFS
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KEYWORD
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base,easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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