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A085445
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Numbers equal to exactly twice the sum of the products of each of their digits.
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1
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OFFSET
| 0,2
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COMMENTS
| Take a number n, create a table with d columns and rows where d=number of digits of n. Each column corresponds to a digit of n and each row to a digit of n. In each cell, multiply the two digits of n represented by that row and column. Add up the sums of all of the rows and all of the columns to get n again.
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EXAMPLE
| 162 = 2*((1*1)+(1*6)+(1*2)+(6*1)+(6*6)+(6*2)+(2*1)+(2*6)+(2*2))
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CROSSREFS
| Cf. A085444.
Sequence in context: A044763 A165676 A160783 * A048511 A206128 A206121
Adjacent sequences: A085442 A085443 A085444 * A085446 A085447 A085448
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KEYWORD
| base,fini,nonn
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AUTHOR
| Chuck Seggelin (barkeep(AT)plastereddragon.com), Jun 30 2003
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