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A075770 Let u(1)=u(2)=u(3)=1, u(n+3)=(n*u(n)+(n+1)*u(n+1)+(n+2)*u(n+2))/(n+3); sequence gives values of n such that u(n) is an integer. 1
1, 2, 3, 10, 14, 350, 702, 817, 1053, 1405, 31426, 44770, 86766, 120118, 216918, 284310, 343278, 347646, 426465, 511758, 767637, 1005030, 1282398, 1483326, 1610510, 1930666, 2434318, 2643990, 2883465, 3345210, 3367430, 3420670, 3647278 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..33.

MATHEMATICA

a[1] = a[2] = a[3] = 1; a[n_] := a[n] = ((n - 3)*a[n - 3] + (n - 2)*a[n - 2] + (n - 1)*a[n - 1])/n; Flatten[ Position[ Table[a[n], {n, 1, 10^5}], _Integer]]

CROSSREFS

Sequence in context: A299205 A268878 A194544 * A135101 A108065 A187767

Adjacent sequences:  A075767 A075768 A075769 * A075771 A075772 A075773

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Oct 09 2002

EXTENSIONS

Edited, corrected and extended by Robert G. Wilson v, Oct 10 2002

a(14) omwards from Lambert Klasen (lambert.klasen(AT)gmx.net), Jul 27 2005

STATUS

approved

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Last modified June 18 14:52 EDT 2019. Contains 324213 sequences. (Running on oeis4.)