OFFSET
1,2
COMMENTS
Numbers k such that either k-th oblong number-+1 is prime.
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
MAPLE
isA173297 := proc(n) local p, pplus, pmin ; pmin := isprime(n*(1+n)-1) ; pplus := isprime(n*(1+n)+1) ; if pmin <> pplus then return true; else return false; end if; end proc: for n from 1 to 300 do if isA173297(n) then printf("%d, ", n) ; end if; end do ; # R. J. Mathar, Feb 21 2010
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Juri-Stepan Gerasimov, Feb 15 2010
EXTENSIONS
46 and 86 inserted by R. J. Mathar, Feb 21 2010
Edited by Charles R Greathouse IV, Mar 24 2010
STATUS
approved