|
|
A226360
|
|
a(n) = smallest triangular number > a(n-1) with a(n-1) as a substring, a(1) = 1.
|
|
0
|
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
Corresponding indices of triangular numbers: 1, 4, 14, 110, 3494, 2742647, 764117282328.
a(8) <= 125453853555414109876348291937610576546289190956. - Giovanni Resta, Jun 05 2013
|
|
LINKS
|
|
|
MATHEMATICA
|
n = 1; t = 1; Print[{n, t}]; Do[ts = ToString[t]; x = n + 1; While[StringFreeQ[ToString[x (x + 1)/2], ts], x++]; Print[{n = x, t = x (x + 1)/2}], {5}]
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|