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Search: id:A090579
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| A090579 |
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Number of numbers with 4 decimal digits and sum of digits = n. |
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+0
3
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| 1, 4, 10, 20, 35, 56, 84, 120, 165, 219, 279, 342, 405, 465, 519, 564, 597, 615, 615, 597, 564, 519, 465, 405, 342, 279, 219, 165, 120, 84, 56, 35, 20, 10, 4, 1
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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There are 9000 numbers with 4 decimal digits, the smallest being 1000 and the largest 9999.
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EXAMPLE
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a(2)=4: 1001, 1010, 1100, 2000.
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PROGRAM
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(PARI) b=vector(36, i, 0); for(n=1000, 9999, a=eval(Vec(Str(n))); b[sum(j=1, 4, a[j])]++); for(n=1, 36, print1(b[n], ", ")) - Herman Jamke (hermanjamke(AT)fastmail.fm), Oct 19 2006
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CROSSREFS
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Cf. A071817 3-digit numbers, A090580 5-digit numbers, A090581 6-digit numbers.
Sequence in context: A127764 A138778 A038409 this_sequence A000292 A101552 A038419
Adjacent sequences: A090576 A090577 A090578 this_sequence A090580 A090581 A090582
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KEYWORD
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base,fini,full,nonn
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AUTHOR
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Hugo Pfoertner (hugo(AT)pfoertner.org), Jan 12 2004
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