|
Search: id:A161625
|
|
|
| A161625 |
|
Sum of all numbers from 1 up to the final digit of prime(n). |
|
+0
1
|
|
| 3, 6, 15, 28, 1, 6, 28, 45, 6, 45, 1, 28, 1, 6, 28, 6, 45, 1, 28, 1, 6, 45, 6, 45, 28, 1, 6, 28, 45, 6, 28, 1, 28, 45, 45, 1, 28, 6, 28, 6, 45, 1, 1, 6, 28, 45, 1, 6, 28, 45, 6, 45, 1, 1, 28, 6, 45, 1, 28, 1, 6, 6, 28, 1, 6, 28, 1, 28, 28, 45, 6, 45, 28, 6, 45, 6, 45, 28, 1, 45
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
FORMULA
|
a(n)= A000217(A007652(n)). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 16 2009
|
|
EXAMPLE
|
a(1)=3=1+2. a(2)=6=1+2+3. a(3)=15=1+2+3+4+5. a(4)=28=1+2+3+4+5+6+7. a(5)=1=1. a(6)=3=1+2.
|
|
MAPLE
|
A007652 := proc(n) ithprime(n) mod 10; end: A000217 := proc(n) n*(n+1)/2 ; end:
A161625 := proc(n) A000217(A007652(n)) ; end: seq(A161625(n), n=1..80) ; # R. J. Mathar, Jun 16 2009
|
|
CROSSREFS
|
Cf. A000027, A000040, A161570.
Sequence in context: A165729 A056278 A000740 this_sequence A069712 A076971 A103529
Adjacent sequences: A161622 A161623 A161624 this_sequence A161626 A161627 A161628
|
|
KEYWORD
|
nonn,base,less
|
|
AUTHOR
|
Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jun 15 2009
|
|
EXTENSIONS
|
Definition reworded and a 16 split in 1,6 by R. J. Mathar, (mathar(AT)strw.leidenuniv.nl), Jun 16 2009
|
|
|
Search completed in 0.002 seconds
|
