OFFSET
1,1
COMMENTS
Also primes of the form (2*n^3 + n^2 + n - 2)/2.
LINKS
K. D. Bajpai, Table of n, a(n) for n = 1..5000
EXAMPLE
a(3)=547: T(8)+C(8)-1 = (1/2)*8*(8+1)+8^3-1 = 547 which is prime.
a(4)=773: T(9)+C(9)-1 = (1/2)*9*(9+1)+9^3-1 = 773 which is prime.
MAPLE
KD:= proc() local a, b, d; a:= (1/2)*n*(n+1); b:=n^3; d:=a+b-1; if isprime(d) then RETURN(d): fi; end:seq(KD(), n=1..500);
CROSSREFS
KEYWORD
nonn
AUTHOR
K. D. Bajpai, Sep 15 2013
STATUS
approved