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A120610 Sum of previous term and preceding non-divisors. 2
2, 3, 5, 10, 13, 33, 63, 126, 187, 442, 869, 1753, 3506, 5257, 12269, 24538, 36805, 85876, 171755, 343507, 687019, 1374038, 2061055, 4809126, 9618252, 14427378, 28854567, 62518388, 125036840, 250073665, 500147342, 1000294687, 2000589376 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(1) = 2, a(2) = 3, for n>=2, a(n+1) = a(n) + sum_{1<=k<n, a(k) does not divide a(n)} a(k).

CROSSREFS

Cf. A120611.

Sequence in context: A103746 A071848 A120938 * A090859 A004681 A044953

Adjacent sequences:  A120607 A120608 A120609 * A120611 A120612 A120613

KEYWORD

nonn

AUTHOR

Frank Adams-Watters (FrankTAW(AT)Netscape.net), Jun 16 2006

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Last modified February 17 02:08 EST 2012. Contains 205978 sequences.