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Search: id:A085128
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| A085128 |
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Multiples of 5 which are members of A002473. Or multiples of 5 with the largest prime divisor < 10. |
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+0
8
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| 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 75, 80, 90, 100, 105, 120, 125, 135, 140, 150, 160, 175, 180, 200, 210, 225, 240, 245, 250, 270, 280, 300, 315, 320, 350, 360, 375, 400, 405, 420, 450, 480, 490, 500, 525, 540, 560, 600, 625, 630, 640, 675, 700
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Number of n permutations (n>=1) of 6 objects t, u, v, z, x, y with repetition allowed, containing n-1 u's. Example: if n=1 then n-1=zero (0) u, a(1)=5 because we have t, v, z, x, y. if n=2 then n-1= one (1) u, a(2)=10 because we have tu, vu, zu, xu, yu, ut, uv, uz, ux, uy. etc. [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Aug 09 2008]
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FORMULA
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G.f.:5/(1-x)^2. a(n)=C(n+0,1)*5^1, n>=1 [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Aug 09 2008]
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MAPLE
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seq(binomial(n+0, 1)*5^1, n=1..44); [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Aug 09 2008]
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CROSSREFS
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Cf. A085125, A085126, A085127, A085129, A080194, A085131, A085132.
Sequence in context: A008706 A140233 A061821 this_sequence A067761 A080193 A023722
Adjacent sequences: A085125 A085126 A085127 this_sequence A085129 A085130 A085131
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KEYWORD
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base,easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 06 2003
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EXTENSIONS
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More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jan 28 2005
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