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A087434 Number of brilliant numbers whose prime factors each have n digits. 2
10, 231, 10296, 563391, 34974066, 2374052871, 171745762321, 12989075028126, 1016377282340160, 81690831917887753, 6708792934060150753, 560785267822390134615, 47573053155260626453431 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Number of brilliant numbers having 2n or 2n-1 digits.

FORMULA

a(n)=A000217(A006879(n)).

CROSSREFS

Cf. A006879, A006880, A078972, A086846, A087435.

Sequence in context: A004702 A027952 A056602 * A012240 A188679 A167867

Adjacent sequences:  A087431 A087432 A087433 * A087435 A087436 A087437

KEYWORD

nonn,base

AUTHOR

Ray Chandler (rayjchandler(AT)sbcglobal.net), Sep 02 2003

EXTENSIONS

a(14) from Ray Chandler (rayjchandler(AT)sbcglobal.net), Jul 21 2005

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.