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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A154785 Row sums of triangle in A154724. 4
 1, 2, 3, 12, 15, 18, 21, 40, 45, 50, 55, 84, 65, 70, 105, 80, 119, 162, 57, 140, 189, 154, 161, 264, 225, 182, 297, 196, 203, 390, 155, 352, 429, 170, 385, 468, 333, 418, 585, 360, 369, 714, 387, 396, 855, 414, 423, 720, 343, 650 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Also, row sums of triangle in A154726. LINKS Nathaniel Johnston, Table of n, a(n) for n = 1..10000 FORMULA a(n) = A154786(n) + n. MAPLE for n from 1 to 50 do rsum:=0: for k from 1 to 2*n-1 do if(k=n or (isprime(k) and isprime(2*n-k)))then rsum:=rsum+k:fi:od: printf("%d, ", rsum):od: # Nathaniel Johnston, Apr 19 2011 CROSSREFS Cf. A154724, A154725, A154726, A154727, A154783, A154784, A154786. Sequence in context: A180630 A173079 A173903 * A090512 A076175 A289870 Adjacent sequences: A154782 A154783 A154784 * A154786 A154787 A154788 KEYWORD easy,nonn AUTHOR Omar E. Pol, Jan 15 2009 EXTENSIONS a(11)-a(50) from Nathaniel Johnston, Apr 19 2011 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 July 15 14:48 EDT 2024. Contains 374333 sequences. (Running on oeis4.)