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Search: id:A154701
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| A154701 |
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3 consecutive Harshad numbers: for each n in this series n, n+1 and n+2 are Harshad numbers. |
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+0
1
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| 1, 2, 3, 4, 5, 6, 7, 8, 110, 510, 511, 1010, 1014, 1015, 2022, 2023, 2464, 3030, 3031, 4912, 5054, 5831, 7360, 8203, 9854, 10010, 10094, 10307, 10308, 11645, 12102, 12103, 12255, 12256, 13110, 13111, 13116, 13880, 14704, 15134, 17152, 17575, 18238, 19600, 19682
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Harshad numbers are also known as Niven numbers.
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LINKS
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Wikipedia, Harshad number
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PROGRAM
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(C) # include <stdio.h>
# include <conio.h>
int is_harshad(int n){
int i, j, count=0;
i=n;
while(i>0){
count=count+i%10;
i=i/10;
}
return n%count==0?1:0;
}
main(){
int k;
clrscr();
for(k=1; k<=30000; k++)
if(is_harshad(k)&&is_harshad(k+1)&&is_harshad(k+2))
printf("%d, ", k);
getch();
return 0;
}
(End)
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CROSSREFS
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A subset of A005349
Sequence in context: A109752 A098755 A028430 this_sequence A004870 A037336 A037443
Adjacent sequences: A154698 A154699 A154700 this_sequence A154702 A154703 A154704
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KEYWORD
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nonn
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AUTHOR
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Avik Roy (avik_3.1416(AT)yahoo.co.in), Jan 14 2009, Jan 15 2009
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