OFFSET
1,2
COMMENTS
a(n) = 1 + 36 + 360 + 3600 + 36000 + ..., for a total of n terms. a(n) = 1 + sum of first n-1 terms of the geometric progression with first term 36 and common ratio 10. a(n) = 1 + 36*A000042(n-1) (the unary sequence).
LINKS
FORMULA
a(n) = 4*10^(n-1) - 3.
EXAMPLE
2*37 - 1 = 73.
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 08 2003
EXTENSIONS
a(1)=1 inserted by David Radcliffe, Jul 25 2015
STATUS
approved