OFFSET
1,3
COMMENTS
The sequence of corresponding squares is A066702. - Robert G. Wilson v, Jan 31 2011
a(14) > 2*10^24. - Giovanni Resta, Jun 20 2015
EXAMPLE
9446031 is triangular and 1306449 is a square.
MATHEMATICA
lst = {0}; For[i=1, i<10^6, i++, t=i(i+1)/2; r=FromDigits@ Reverse@ IntegerDigits@ t; If[ Mod[t, 10] > 0 && IntegerQ@ Sqrt@ r, AppendTo[lst, t]; Print@ lst]]
CROSSREFS
KEYWORD
base,nonn,more
AUTHOR
Erich Friedman, Jan 14 2002
EXTENSIONS
More terms from Jason Earls and the author, Jan 15 2002
Offset and definition modified at the suggestion of Harvey P. Dale, Jan 30 2011
a(11) from Donovan Johnson, Jan 31 2011
a(12)-a(13) from Giovanni Resta, Jun 20 2015
STATUS
approved