A161625 Sum of all numbers from 1 up to the final digit of prime(n).

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

Offset

1,1

Links

Table of n, a(n) for n=1..80.

Formula

a(n)= A000217(A007652(n)). - R. J. Mathar, 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: A348378 A000740 A056278 * A234848 A300761 A069712

Adjacent sequences: A161622 A161623 A161624 * A161626 A161627 A161628

Keyword

nonn,base,less

Author

Juri-Stepan Gerasimov, Jun 15 2009

Extensions

Definition reworded and a 16 split in 1,6 by R. J. Mathar, Jun 16 2009

Status

approved