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A066869
Sum of the first n safe primes.
1
5, 12, 23, 46, 93, 152, 235, 342, 509, 688, 915, 1178, 1525, 1884, 2267, 2734, 3213, 3716, 4279, 4866, 5585, 6424, 7287, 8174, 9157, 10176, 11363, 12646, 13953, 15272, 16639, 18078, 19565, 21088, 22707, 24530, 26437, 28464, 30503, 32566, 34665
OFFSET
1,1
COMMENTS
The subsequence of prime partial sums of safe primes begins: 5, 23, 509, 2267, 9157, 26437. The subsubsequence of safe prime partial sums of safe primes begins: 5, 23, and then what values? Note that A172037 Prime partial sums of Sophie Germain primes A005384 is related because 2p+1 is called a safe prime if p is a Sophie Germain prime. - Jonathan Vos Post, Jan 30 2010
MATHEMATICA
Accumulate[Select[Prime[Range[350]], PrimeQ[(#-1)/2]&]] (* Harvey P. Dale, Jul 27 2011 *)
CROSSREFS
Cf. A005385.
Cf. A172037. - Jonathan Vos Post, Jan 30 2010
Sequence in context: A220425 A130624 A344846 * A023172 A270681 A212540
KEYWORD
easy,nonn
AUTHOR
Joseph L. Pe, Jan 21 2002
STATUS
approved