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A008851
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Congruent to 0 or 1 mod 5.
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28
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0, 1, 5, 6, 10, 11, 15, 16, 20, 21, 25, 26, 30, 31, 35, 36, 40, 41, 45, 46, 50, 51, 55, 56, 60, 61, 65, 66, 70, 71, 75, 76, 80, 81, 85, 86, 90, 91, 95, 96, 100, 101, 105, 106, 110, 111, 115, 116, 120, 121, 125, 126, 130, 131, 135, 136, 140, 141, 145, 146, 150, 151
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| n^2 and n have same last digit.
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REFERENCES
| Dickson, History of Theory of Numbers, I, p. 459.
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LINKS
| Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
Index to sequences with linear recurrences with constant coefficients, signature (1,1,-1).
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FORMULA
| a(n)=5*n-a(n-1)-4 (with a(0)=0) [From Vincenzo Librandi, Nov 18 2010]
G.f. x^2*(1+4*x) / ( (1+x)*(x-1)^2 ). - R. J. Mathar, Oct 07 2011
a(n+1)=Sum_k>=0 {A030308(n,k)*A146523(k)}. - From DELEHAM Philippe, Oct 17 2011.
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MAPLE
| a[0]:=0:a[1]:=1:for n from 2 to 100 do a[n]:=a[n-2]+5 od: seq(a[n], n=0..61); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 16 2008
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PROG
| (Haskell)
a008851 n = a008851_list !! (n-1)
a008851_list = [10*n + m | n <- [0..], m <- [0, 1, 5, 6]]
-- Reinhard Zumkeller, Jul 27 2011
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CROSSREFS
| Cf. A003226, A045953, A046831, A046851, A086457.
Sequence in context: A074627 A067612 A064957 * A079259 A029772 A046827
Adjacent sequences: A008848 A008849 A008850 * A008852 A008853 A008854
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Offset corrected by Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 27 2011
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