A079705 3p^2 where p runs through the primes.

12, 27, 75, 147, 363, 507, 867, 1083, 1587, 2523, 2883, 4107, 5043, 5547, 6627, 8427, 10443, 11163, 13467, 15123, 15987, 18723, 20667, 23763, 28227, 30603, 31827, 34347, 35643, 38307, 48387, 51483, 56307, 57963, 66603, 68403, 73947, 79707, 83667, 89787, 96123

Offset: 1

Author

Jon Perry, Jan 31 2003

Keywords

• easy
• nonn

Examples

			For n = 2, 3*prime(2)^2 = 3*3^2 = 27.
		

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Programs

Magma

[3*p^2: p in PrimesUpTo(200)]; // Vincenzo Librandi, Mar 27 2014

Mathematica

3 #^2 & /@ Prime[Range[40]]
3 Prime[Range[30]]^2 (* Vincenzo Librandi, Mar 27 2014 *)

PARI

forprime (p=2,100,print1(p^2*3, ", "))

PARI

a(n) = 3*prime(n)^2; \\ Michel Marcus, Dec 27 2021

Python

from sympy import primerange
print([3*p**2 for p in primerange(1, 180)]) # Michael S. Branicky, Dec 27 2021

Formula

a(n) = 3*A001248(n) = A003415(A030078(n)). - Reinhard Zumkeller, Jun 26 2011

Extensions

More terms from Harvey P. Dale, Feb 13 2003

Offset corrected by Vincenzo Librandi, Mar 27 2014