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

 

Logo

"Email this user" was broken Aug 14 to 9am Aug 16. If you sent someone a message in this period, please send it again.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A130201 Odious oblong (pronic) numbers. 1
2, 42, 56, 110, 182, 342, 506, 552, 702, 812, 930, 992, 1190, 1332, 1640, 1722, 2162, 2450, 2756, 2862, 2970, 3080, 3306, 3540, 3782, 4422, 4692, 4970, 5700, 6006, 6320, 6480, 6806, 7310, 7832, 8372, 8742, 9120, 9506, 9900 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..39.

FORMULA

a(n) = 2*A130202(n). Multiplication by 2 preserves odiousness, hence this sequence is twice odious triangular numbers.

MATHEMATICA

Select[Table[n(n + 1), {n, 100}], OddQ[Plus @@ IntegerDigits[ #, 2]] &]

CROSSREFS

Cf. This sequence is the intersection of odious (A000069) and oblong (A002378) numbers.

Sequence in context: A278847 A193270 A076391 * A076392 A048373 A066563

Adjacent sequences:  A130198 A130199 A130200 * A130202 A130203 A130204

KEYWORD

nonn

AUTHOR

Tanya Khovanova, May 16 2007

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy .

Last modified August 21 17:28 EDT 2017. Contains 290891 sequences.