OFFSET
1,1
LINKS
David A. Corneth, Table of n, a(n) for n = 1..3114
EXAMPLE
1365=3 * 5 * 7 * 13 and (3 * 5 * 7 * 13+1)/2, (3+5 * 7 * 13)/2, (5+3 * 7 * 13)/2, (7+3 * 5 * 13)/2, (13+3 * 5 * 7)/2, (3 * 5+7.13)/2, (3 * 7+5 * 13)/2, (3 * 13+5 * 7)/2 are all primes and 1365 is the smallest such integer which is the product of 4 primes, so 1365 is in the sequence.
CROSSREFS
KEYWORD
nonn
AUTHOR
Kok Seng Chua (chuakokseng(AT)hotmail.com), Mar 05 2007
EXTENSIONS
New name from David A. Corneth, Jan 09 2021
STATUS
approved