|
Search: id:A127273
|
|
|
| A127273 |
|
Numbers n such that sum of the digits of n and of n+1 divides n + (n+1), n >= 1. |
|
+0
2
|
|
| 1, 2, 3, 4, 5, 6, 7, 8, 10, 13, 22, 31, 40, 52, 67, 73, 94, 100, 103, 104, 112, 121, 123, 130, 136, 142, 148, 161, 175, 180, 199, 202, 203, 211, 218, 220, 232, 237, 240, 256, 262, 275, 283, 294, 301, 302, 310, 314, 322, 325, 337, 351, 364, 391, 400, 401, 412, 418
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
EXAMPLE
|
Sum of the digits of 52 and 53 is 7+8 = 15, which divides 52+53 = 105 = 7*15. Hence 52 is a term.
Sum of the digits of 9 and 10 is 9+1 = 10, which does not divide 9+10 = 19. Hence 9 is not in the sequence.
|
|
MATHEMATICA
|
Select[ Range[ 325 ], Mod[ 2#+1, Apply[ Plus, IntegerDigits[ # ] ]+Apply[ Plus, IntegerDigits[ #+1 ] ] ]==0& ] - Farideh Firoozbakht
|
|
CROSSREFS
|
Sequence in context: A017901 A005709 A101917 this_sequence A143287 A033073 A039172
Adjacent sequences: A127270 A127271 A127272 this_sequence A127274 A127275 A127276
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
J. M. Bergot (thekingfishb(AT)yahoo.ca), Mar 27 2007
|
|
EXTENSIONS
|
Edited, corrected and extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de) and Farideh Firoozbakht (mymontain(AT)yahoo.com), Mar 29 2007
|
|
|
Search completed in 0.002 seconds
|
