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A027690 n^2 + n + 5. 4
5, 7, 11, 17, 25, 35, 47, 61, 77, 95, 115, 137, 161, 187, 215, 245, 277, 311, 347, 385, 425, 467, 511, 557, 605, 655, 707, 761, 817, 875, 935, 997, 1061, 1127, 1195, 1265, 1337, 1411, 1487, 1565, 1645, 1727, 1811, 1897, 1985, 2075, 2167, 2261 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

COMMENTS

For n>1: a(n) = A176271(n+1,3). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 13 2010]

LINKS

P. De Geest, Palindromic Quasi_Over_Squares of the form n^2+(n+X)

Index entries for sequences related to linear recurrences with constant coefficients, signature (3,-3,1).

FORMULA

a(n)=2*n+a(n-1) (with a(0)=5) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 05 2010]

MAPLE

with (combinat):seq(fibonacci(3, n)+n+4, n=0..47); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 07 2008

MATHEMATICA

Table[n^2+n+5, {n, 0, 100}] (T. D. Noe, Oct 29 2009)

CROSSREFS

Cf. A002522.

Sequence in context: A067830 A191019 A106862 * A087200 A153118 A145987

Adjacent sequences:  A027687 A027688 A027689 * A027691 A027692 A027693

KEYWORD

nonn,easy

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com)

EXTENSIONS

Corrected by T. D. Noe (noe(AT)sspectra.com), Nov 09 2006

Definition and offset fixed by Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jul 06 2009

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Last modified February 13 06:53 EST 2012. Contains 205451 sequences.