A095226 Diagonal of the triangle A095225.

1, 153, 66, 19110, 21115, 39621, 8128, 76636, 83845, 117855, 158766, 25878, 188191, 18669105, 27081120, 31868136, 1308153, 39547171, 46508190, 49795210, 50215231, 2210253, 64428276, 71706300, 72306325, 83224351, 3774378, 97601406, 98413435

Offset

1,2

Comments

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

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

Links

Table of n, a(n) for n=1..29.

Example

1
3 153
6 36 66
10 210 24310 88410
...
Separating the triangular numbers for visualization with a bar, the sequence is
1, 15|3, 6|6, 191|10, 211|15, 396|21, 81|28, 766|36,...

Maple

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

Crossrefs

Cf. A095225.

Sequence in context: A099117 A109778 A156740 * A346630 A165340 A183985

Adjacent sequences: A095223 A095224 A095225 * A095227 A095228 A095229

Keyword

nonn

Author

Amarnath Murthy, Jun 10 2004

Extensions

Corrected and extended by R. J. Mathar, Aug 03 2007

Status

approved