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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A071966 Composite numbers such that smallest prime factor, largest prime factor and sum of prime factors (with repetition) are all a sum of two squares. 0
4, 16, 20, 25, 30, 32, 52, 65, 78, 80, 90, 130, 145, 148, 156, 164, 169, 174, 200, 238, 240, 244, 250, 256, 265, 270, 272, 286, 289, 290, 300, 306, 318, 320, 340, 348, 360, 388, 400, 408, 436, 442, 450, 452, 455, 464, 480, 481, 505, 512, 522, 540, 546, 574 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

481 is here since spf(481)= 13 = 2^2+3^2, lpf(481)= 37 = 1^2+6^2 and sopfr(481)= 50 = 1^2+7^2.

CROSSREFS

Cf. A001481.

Sequence in context: A175527 A146510 A032827 * A039943 A193996 A067671

Adjacent sequences:  A071963 A071964 A071965 * A071967 A071968 A071969

KEYWORD

nonn

AUTHOR

Jason Earls (zevi_35711(AT)yahoo.com), Jun 15 2002

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 14 16:37 EST 2012. Contains 205635 sequences.