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
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
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Jun 10 2004
EXTENSIONS
Corrected and extended by R. J. Mathar, Aug 03 2007
STATUS
approved