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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A045798 Oddish numbers (prime to 10 and 10's digit is odd). 14
11, 13, 17, 19, 31, 33, 37, 39, 51, 53, 57, 59, 71, 73, 77, 79, 91, 93, 97, 99, 111, 113, 117, 119, 131, 133, 137, 139, 151, 153, 157, 159, 171, 173, 177, 179, 191, 193, 197, 199, 211, 213, 217, 219, 231, 233, 237, 239, 251, 253, 257, 259 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

_Reinhard Zumkeller_, Table of n, a(n) for n = 1..10000

FORMULA

Conjecture a(n) = a(n-1)+a(n-4)-a(n-5). G.f.: x*(11+2*x+4*x^2+2*x^3+x^4)/((1-x)^2*(1+x)*(1+x^2)). [Colin Barker, Apr 14 2012]

PROG

(Haskell)

a045798 n = a045798_list !! (n-1)

a045798_list = filter (odd . (`mod` 10) . (`div` 10)) a045572_list

-- Reinhard Zumkeller, Dec 10 2011

CROSSREFS

Cf. A045797.

Complement of A045797 with respect to A045572.

Sequence in context: A186811 A038926 A168446 * A155071 A003626 A154981

Adjacent sequences:  A045795 A045796 A045797 * A045799 A045800 A045801

KEYWORD

nonn,base,easy,nice

AUTHOR

J. H. Conway (conway(AT)math.princeton.edu).

EXTENSIONS

More terms from Erich Friedman.

STATUS

approved

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 May 26 02:53 EDT 2013. Contains 225653 sequences.