A036439 a(n) = a(n-1) + prime(n-1), with a(1)=2.

2, 4, 7, 12, 19, 30, 43, 60, 79, 102, 131, 162, 199, 240, 283, 330, 383, 442, 503, 570, 641, 714, 793, 876, 965, 1062, 1163, 1266, 1373, 1482, 1595, 1722, 1853, 1990, 2129, 2278, 2429, 2586, 2749, 2916, 3089, 3268, 3449, 3640, 3833, 4030, 4229, 4440, 4663

Offset: 1

Author

Pavel Bubak (pbub6070(AT)beta.ms.mff.cuni.cz)

Keywords

• nonn
• easy

Comments

Old name was "a(n) = 2 + the sum of the first n-1 prime numbers".

Links

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

Crossrefs

A014284(n) + 1.

Programs

Mathematica

nxt[{n_,a_}]:={n+1,a+Prime[n]}; NestList[nxt,{1,2},50][[All,2]] (* Harvey P. Dale, Sep 21 2016 *)

PARI

a(n) = 2 + sum(i=1, n-1, prime(i)); \\ Michel Marcus, Aug 12 2013

Extensions

More terms from James Sellers, Feb 06 2000

Offset changed and definition improved from Bruno Berselli, Jul 30 2013