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A027626 Denominator of n*(n+5)/((n+2)*(n+3)). 1
1, 2, 10, 5, 7, 28, 12, 15, 55, 22, 26, 91, 35, 40, 136, 51, 57, 190, 70, 77, 253, 92, 100, 325, 117, 126, 406, 145, 155, 496, 176, 187, 595, 210, 222, 703, 247, 260, 820, 287, 301, 946, 330, 345, 1081, 376, 392 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

a(n) = GCD of n-th and (n+1)st tetrahedral numbers (A000292). - Ross La Haye (rlahaye(AT)new.rr.com), Sep 13 2003

G.f.: (x^8-2x^5+x^4+2x^3+10x^2+2x+1)/(1-x^3)^3.

CROSSREFS

Cf. A027625.

Sequence in context: A000170 A038216 A145911 * A096668 A114232 A070730

Adjacent sequences:  A027623 A027624 A027625 * A027627 A027628 A027629

KEYWORD

nonn,frac

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 16 07:32 EST 2012. Contains 205874 sequences.