A069102 a(1) = 1; a(2) = 1; a(n) = Prime[n-1] + Prime[n-2] if n > 2.

1, 1, 5, 8, 12, 18, 24, 30, 36, 42, 52, 60, 68, 78, 84, 90, 100, 112, 120, 128, 138, 144, 152, 162, 172, 186, 198, 204, 210, 216, 222, 240, 258, 268, 276, 288, 300, 308, 320, 330, 340, 352, 360, 372, 384, 390, 396, 410, 434, 450, 456, 462, 472, 480, 492, 508

Offset: 1

Author

Joseph L. Pe, Apr 06 2002

Keywords

• nonn

Examples

			a(3) = Prime[2] + Prime[1] = 3 + 2 = 5.
		

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A001043, A011974.

Programs

Mathematica

Join[{1,1},Total/@Partition[Prime[Range[60]],2,1]] (* Harvey P. Dale, Feb 01 2024 *)

PARI

print1("1,1,"); for(n=1,100,print1(prime(n)+prime(n+1)","))

Extensions

More terms from Ralf Stephan, Mar 20 2003