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Revision History for A161625

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A161625

Sum of all numbers from 1 up to the final digit of prime(n).
(history; published version)

#5 by R. J. Mathar at Sat Mar 31 08:19:37 EDT 2012

STATUS

editing

approved

#4 by R. J. Mathar at Sat Mar 31 08:19:30 EDT 2012

MAPLE

A161625 := proc(n) A000217(A007652(n)) ; end: seq(A161625(n), n=1..80) ; # _R. J. Mathar, _, Jun 16 2009

EXTENSIONS

Definition reworded and a 16 split in 1,6 by _R. J. Mathar, (mathar(AT)strw.leidenuniv.nl), _, Jun 16 2009

STATUS

approved

editing

#3 by Russ Cox at Fri Mar 30 18:52:33 EDT 2012

AUTHOR

_Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), _, Jun 15 2009

Discussion

Fri Mar 30

18:52

OEIS Server: https://oeis.org/edit/global/257

#2 by Russ Cox at Fri Mar 30 17:40:00 EDT 2012

FORMULA

a(n)= A000217(A007652(n)). - _R. J. Mathar (mathar(AT)strw.leidenuniv.nl), _, Jun 16 2009

Discussion

Fri Mar 30

17:40

OEIS Server: https://oeis.org/edit/global/190

#1 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010

NAME

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

DATA

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

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.

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

STATUS

approved