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A121535
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Numbers that are sums of substrings of their reversals.
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2
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1, 2, 3, 4, 5, 6, 7, 8, 9, 54, 271, 7846, 937767, 605772815, 87246282837
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| a(16) <= 547880799393. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), May 25 2009]
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EXAMPLE
| For example: 54 = 45 + 4 + 5; 271 = 172 + 17 + 72 + 1 + 7 + 2.
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MATHEMATICA
| Select[Table[n, {n, 10000000 }], # == Plus @@ ToExpression[ Flatten[Table[ StringTake[StringReverse[ToString[ # ]], {i, j}], {i, StringLength[ToString[ # ]]}, {j, i, StringLength[ToString[ # ]]}]]] &]
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CROSSREFS
| Cf. A121947 - Numbers that are sums of proper substrings of its reversal.
Sequence in context: A183532 A024660 A133377 * A082743 A083838 A087082
Adjacent sequences: A121532 A121533 A121534 * A121536 A121537 A121538
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KEYWORD
| base,more,nonn
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AUTHOR
| Tanya Khovanova (tanyakh(AT)yahoo.com), Sep 08 2006
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EXTENSIONS
| a(14)-a(15) from Donovan Johnson (donovan.johnson(AT)yahoo.com), May 25 2009
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