login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A114843 Indices of Fibonacci numbers with 4 distinct prime factors. 0
20, 24, 27, 28, 32, 52, 55, 74, 77, 85, 87, 91, 93, 97, 115, 123, 143, 146, 149, 157, 161, 163, 178, 187, 197, 209, 211, 214, 215, 221, 223, 239, 242, 249, 262, 269, 283, 287, 307, 311, 313, 321, 334, 349, 379, 391, 393, 409, 421, 453, 487, 493, 499, 523, 581 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

LINKS

Blair Kelly, Fibonacci and Lucas Factorizations.

EXAMPLE

a(1)=20 because 20th fibonacci number consists of 4 distinct prime factors (i.e. 6765 = 3 x 5 x 11 x 41)

PROG

(PARI) n=1; while(n<350, if(omega(fibonacci(n))==4, print1(n, ", ")); n++)

CROSSREFS

Sequence in context: A117737 A062908 A111323 * A174629 A108373 A109131

Adjacent sequences:  A114840 A114841 A114842 * A114844 A114845 A114846

KEYWORD

nonn

AUTHOR

Shyam Sunder Gupta (guptass(AT)rediffmail.com), Feb 19 2006

EXTENSIONS

More terms from Ryan Propper (rpropper(AT)stanford.edu), Apr 26 2006

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 16 15:27 EST 2012. Contains 205930 sequences.