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Search: id:A085445
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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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+0
2
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OFFSET
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0,2
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COMMENT
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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
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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
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Cf. A085444.
Sequence in context: A044763 A165676 A160783 this_sequence A048511 A031692 A115592
Adjacent sequences: A085442 A085443 A085444 this_sequence A085446 A085447 A085448
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KEYWORD
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base,fini,nonn
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AUTHOR
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Chuck Seggelin (barkeep(AT)plastereddragon.com), Jun 30 2003
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