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!)
 A115261 Prime numbers such that the absolute difference of the sum of their digits in odd positions and the sum of their digits in even positions is also a prime. 4
 2, 3, 5, 7, 13, 29, 31, 41, 47, 53, 61, 79, 83, 97, 101, 113, 137, 139, 151, 157, 163, 167, 173, 179, 191, 193, 211, 223, 227, 233, 251, 269, 277, 281, 283, 311, 313, 337, 359, 379, 383, 401, 409, 421, 431, 443, 467, 487, 541, 557, 563, 577, 599, 601, 607, 641 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Jens Kruse Andersen, Table of n, a(n) for n = 1..10000 EXAMPLE 1237 is in the sequence because it is prime and abs((7+2)-(3+1)) = 5 is prime MAPLE Df:=proc(N) j:=1; for n from 1 while j<=N do B:= convert(ithprime(n), base, 10); ap:=-(sum(B[2*i], i=1..nops(B)/2)-sum(B[2*n+1], i=0..(nops(B)-1)/2)); if (isprime(abs(ap)) = true) then a[j]:=ithprime(n); j:=j+1; fi; od; end: CROSSREFS Cf. A040997, A005017, A063792, A087593, A042939, A041000, A040164, A115259, A115260. Sequence in context: A075238 A346408 A158281 * A063792 A270391 A172508 Adjacent sequences:  A115258 A115259 A115260 * A115262 A115263 A115264 KEYWORD base,nonn AUTHOR Paolo P. Lava and Giorgio Balzarotti, Jan 20 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 August 5 00:15 EDT 2021. Contains 346456 sequences. (Running on oeis4.)