The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A122381 Numbers n such that A014148[n] is a prime. 2
 1, 2, 3, 6, 10, 23, 31, 46, 55, 58, 66, 70, 82, 91, 118, 131, 151, 163, 182, 187, 198, 199, 203, 222, 275, 279, 334, 346, 351, 358, 402, 411, 462, 470, 515, 582, 591, 619, 639, 650, 667, 671, 679, 706, 739, 750, 767, 835, 851, 875, 882, 899, 919, 926, 962, 966 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Corresponding primes are listed in A122382[n] = A014148[ a(n) ] = {2,7,17,103,467,6577,17189,61627,109919,130531,198109,239579,399557,559313,...}. LINKS FORMULA A014148[n] = Sum[ Sum[ Prime[k], {k,1,m} ], {m,1,n} ]. A014148[ a(n) ] = A122382[n]. EXAMPLE A014148[n] begins {2,7,17,34,62,103,161,238,338,467,627,824,1062,1343,...}. a(1) = 1 because A014148[1] = 2 is prime. a(2) = 2 because A014148[2] = 7 is prime. MATHEMATICA p=0; s=0; f=0; Do[p=Prime[n]; s=s+p; f=f+s; If[PrimeQ[f], Print[{n, f}]], {n, 1, 2000}] CROSSREFS Cf. A014148, A122382. Sequence in context: A002992 A130867 A218210 * A141034 A300442 A152536 Adjacent sequences:  A122378 A122379 A122380 * A122382 A122383 A122384 KEYWORD nonn AUTHOR Alexander Adamchuk, Aug 30 2006 STATUS approved

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

Last modified November 27 16:35 EST 2021. Contains 349394 sequences. (Running on oeis4.)