OFFSET
1,3
FORMULA
a(n+1) = a(n)*prime(n) + (-1)^n*primorial(prime(n-1)) for n >= 3. - Alexandre Herrera, Sep 03 2023
PROG
(PARI) a(n)=if(n<1, n>0, prod(i=1, n-1, prime(i))*sum(i=1, n-1, (-1)^i/prime(i), 1)) /* Michael Somos, Feb 01 2004 */
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved