OFFSET
1,1
LINKS
K. D. Bajpai, Table of n, a(n) for n = 1..5970
EXAMPLE
a(1) = 15 = 3^2 + 5 + 1 = 3 * 5 is semiprime, 3 and 5 are consecutive primes.
a(2) = 33 = 5^2 + 7 + 1 = 3 * 11 is semiprime, 5 and 7 are consecutive primes.
MAPLE
MATHEMATICA
Select[Table[Prime[n]^2 + Prime[n + 1] + 1, {n, 500}], PrimeOmega[#] == 2 &]
CROSSREFS
KEYWORD
nonn
AUTHOR
K. D. Bajpai, May 09 2014
STATUS
approved