The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A076793 a(n) = Sum_{k=1..n} 2^prime(k). 9
 0, 4, 12, 44, 172, 2220, 10412, 141484, 665772, 9054380, 545925292, 2693408940, 140132362412, 2339155617964, 11135248640172, 151872736995500, 9159071991736492, 585619824295159980, 2891462833508853932 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS a(468) has 1000 decimal digits. - Michael De Vlieger, Jul 14 2017 LINKS Michael De Vlieger, Table of n, a(n) for n = 0..467 FORMULA a(n) = a(n-1) + 2^prime(n). EXAMPLE a(1) = 2^prime(1) = 2^2 = 4; a(2) = 4 + 2^prime(2) = 4 + 2^3 = 12. MATHEMATICA Table[Sum[2^Prime[k], {k, n}], {n, 0, 18}] (* Michael De Vlieger, Jul 14 2017 *) PROG (PARI) a(n) = sum(k=1, n, 2^prime(k)) \\ Michel Marcus, Jul 23 2013 CROSSREFS Cf. A076794. Sequence in context: A055542 A149365 A000759 * A007860 A226855 A039740 Adjacent sequences:  A076790 A076791 A076792 * A076794 A076795 A076796 KEYWORD easy,nonn AUTHOR Walter Carlini, Nov 17 2002 EXTENSIONS More terms from R. J. Mathar, Aug 31 2007 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 29 07:49 EDT 2022. Contains 354122 sequences. (Running on oeis4.)