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1001, 2002, 3003, 4004, 5005, 6006, 7007, 8008, 9009, 10010, 11011, 12012, 13013, 14014, 15015, 16016, 17017, 18018, 19019, 20020, 21021, 22022, 23023, 24024, 25025, 27027, 28028, 29029, 30030, 31031, 32032, 33033, 34034, 35035, 36036
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Also a(n)=77*13n; or, a(n)=91*11n;
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REFERENCES
| Italo Ghersi, Matematica dilettevole e curiosa, pag. 138, Hoepli, Milano, 1967
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FORMULA
| a(n) = 143*7n
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EXAMPLE
| For n=1, 143*7n=1001; n=238, 143*7n=238238
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CROSSREFS
| Sequence in context: A029722 A077493 A044881 * A100709 A130600 A114387
Adjacent sequences: A153811 A153812 A153813 * A153815 A153816 A153817
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KEYWORD
| nonn
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AUTHOR
| Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 02 2009
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