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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A117993 Heptagonal numbers with only odd digits. 1
1, 7, 55, 1177, 3553, 9517, 11799, 13579, 17935, 31753, 71995, 93799, 97713, 117397, 135373, 371911, 377719, 599515, 733597, 777573, 1131313, 1331155, 1371591, 1555119, 3391315, 3731377, 3979717, 5131573, 7137715, 7333353, 9193933, 13755771, 13979515 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..33.

MATHEMATICA

Select[Table[n (5n-3)/2, {n, 4000}], AllTrue[IntegerDigits[#], OddQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, Feb 28 2015 *)

CROSSREFS

Cf. A000566, A117994.

Sequence in context: A227544 A094656 A239156 * A055056 A305282 A197228

Adjacent sequences:  A117990 A117991 A117992 * A117994 A117995 A117996

KEYWORD

base,nonn

AUTHOR

Luc Stevens (lms022(AT)yahoo.com), May 03 2006

EXTENSIONS

Corrected by Harvey P. Dale, Feb 28 2015

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 25 10:31 EDT 2019. Contains 321470 sequences. (Running on oeis4.)