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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A112775 Numbers n such that 6n+1 is semiprime. 1
4, 8, 9, 14, 15, 19, 20, 22, 24, 28, 31, 34, 36, 39, 41, 42, 43, 44, 48, 49, 50, 53, 59, 60, 65, 67, 69, 71, 74, 75, 78, 80, 82, 84, 85, 86, 88, 89, 92, 93, 94, 97, 98, 108, 109, 111, 113, 114, 116, 117, 120, 124, 127, 130, 132, 133, 136, 139, 140, 144, 145, 148, 149 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Resulting semiprimes in A112771.

FORMULA

a(n) = (A112771(n) - 1)/6.

CROSSREFS

Sequence in context: A060299 A120512 A046954 * A107747 A121763 A110087

Adjacent sequences:  A112772 A112773 A112774 * A112776 A112777 A112778

KEYWORD

easy,nonn

AUTHOR

Jonathan Vos Post (jvospost3(AT)gmail.com) and Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 15 2005

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 06:20 EST 2012. Contains 205570 sequences.