OFFSET
1,1
COMMENTS
For some n, a(n) are abnormally large: note, e.g., that if q-p=2, then n cannot be of the form 4+3k, that is why a(4), a(7), a(10), ... are larger than neighbor terms; also, a(67) > 1.1*10^11. Is the sequence infinite?
LINKS
Zak Seidov, Table of n, a(n) for n = 1..66
FORMULA
a(n) = prevprime(A179210(n)). - Robert G. Wilson v, Dec 23 2016
EXAMPLE
First 10 cases of {n,p,q,r}: {1,3,5,7}, {2,2,3,5}, {3,29,31,37}, {4,8117,8123,8147}, {5,137,139,149}, {6,197,199,211}, {7,45433,45439,45481}, {8,1931,1933,1949}, {9,521,523,541}, {10,156151,156157,156217}.
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, May 31 2012
STATUS
approved