login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A095226 Diagonal of the triangle A095225. 2

%I #8 Aug 08 2015 20:18:17

%S 1,153,66,19110,21115,39621,8128,76636,83845,117855,158766,25878,

%T 188191,18669105,27081120,31868136,1308153,39547171,46508190,49795210,

%U 50215231,2210253,64428276,71706300,72306325,83224351,3774378,97601406,98413435

%N Diagonal of the triangle A095225.

%C n-th triangular number with digit string ending in n-th triangular number.

%C By definition the n-th smallest member of A000217 which has the same least significant decimal digits as A000217(n). - _R. J. Mathar_, Aug 03 2007

%e 1

%e 3 153

%e 6 36 66

%e 10 210 24310 88410

%e ...

%e Separating the triangular numbers for visualization with a bar, the sequence is

%e 1, 15|3, 6|6, 191|10, 211|15, 396|21, 81|28, 766|36,...

%p A000217 := proc(n) n*(n+1)/2 ; end: A095225 := proc(nrow) local a,i,dlen; i := nrow ; a := [A000217(i)] ; dlen := ilog10(a[1])+1 ; while nops(a) < nrow do i := i+1 ; if A000217(i) mod 10^dlen = a[1] then a := [op(a),A000217(i)] ; fi ; od ; RETURN(a) ; end: A095226 := proc(n) op(-1,A095225(n)) ; end: seq(op(A095226(n)),n=1..80) ; # _R. J. Mathar_, Aug 03 2007

%Y Cf. A095225.

%K nonn

%O 1,2

%A _Amarnath Murthy_, Jun 10 2004

%E Corrected and extended by _R. J. Mathar_, Aug 03 2007

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 16:58 EDT 2024. Contains 371254 sequences. (Running on oeis4.)