OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
FORMULA
sopfr(k+1) mod sopfr(k) = 0.
a(n) = A129316(n+1). - Amiram Eldar, Oct 26 2019
EXAMPLE
a(6)=161 since sopfr(160)=sopfr(2^5*5)=10+5=15 and sopfr(161)=sopfr(7*23)=30.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Walter Kehowski, Apr 09 2007
STATUS
approved