OFFSET
1,2
FORMULA
a(n) = A061431(n)-n*(n+1)/2.
EXAMPLE
a(4) = 2510 because 7 divides 2513, 8 divides 2512, 9 divides
2511 and 10 divides 2510.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Amarnath Murthy, Feb 18 2004
EXTENSIONS
Edited and extended by David Wasserman, Dec 27 2005
STATUS
approved