This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A066869 #10 Aug 04 2023 23:16:45 %S A066869 5,12,23,46,93,152,235,342,509,688,915,1178,1525,1884,2267,2734,3213, %T A066869 3716,4279,4866,5585,6424,7287,8174,9157,10176,11363,12646,13953, %U A066869 15272,16639,18078,19565,21088,22707,24530,26437,28464,30503,32566,34665 %N A066869 Sum of the first n safe primes. %C A066869 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 %t A066869 Accumulate[Select[Prime[Range[350]],PrimeQ[(#-1)/2]&]] (* _Harvey P. Dale_, Jul 27 2011 *) %Y A066869 Cf. A005385. %Y A066869 Cf. A172037. - _Jonathan Vos Post_, Jan 30 2010 %K A066869 easy,nonn %O A066869 1,1 %A A066869 _Joseph L. Pe_, Jan 21 2002