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A108200 Least positive k such that k*n + 1 is a golden semiprime (A108540). 0
5, 7, 62, 19, 1, 31, 2, 1254, 1692, 85, 912, 49, 20796, 1, 1234, 627, 50, 846, 4, 860, 28, 456, 4076, 418, 34, 10398, 564, 21, 91250, 617, 6, 47670, 304, 25, 6218, 423, 352018, 2, 6932, 430, 9348, 14, 400, 228, 2874, 2038, 324, 209, 12, 17, 5562, 5199, 25784, 282 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Conjecture: for every n > 4 there exists a number k < n^[n/2] such that k*n + 1 is a golden semiprime, where [] is the floor function.

EXAMPLE

a(3) = 62 because 62*3+1 = 187 = 11*17 and 11*phi-17 = 0.7983... < 1.

CROSSREFS

Cf. A108540.

Sequence in context: A106112 A201109 A177336 * A077780 A130189 A180755

Adjacent sequences:  A108197 A108198 A108199 * A108201 A108202 A108203

KEYWORD

nonn

AUTHOR

Jason Earls (zevi_35711(AT)yahoo.com), Jun 15 2005

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Last modified February 16 12:41 EST 2012. Contains 205909 sequences.