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!)
 A088985 Numbers of the form prime(prime(n)+1), with n satisfying prime(n)+2 = prime(n+1). 2
 7, 13, 37, 61, 113, 181, 281, 359, 557, 593, 787, 863, 1069, 1163, 1213, 1439, 1511, 1733, 1831, 2069, 2347, 2903, 3011, 3271, 3739, 4139, 4409, 4561, 4783, 4937, 6221, 6317, 6359, 6659, 6857, 8111, 8231, 8387, 8521, 8753, 9311, 10007, 10453 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Also, prime numbers p such that there exists a positive integer n with the property that p is the only prime satisfying prime(prime(n)) < p < prime(prime(n+1)). LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 EXAMPLE prime(3) + 2 = prime(4), hence prime(prime(3)+1) = 13 is in the sequence. MATHEMATICA a={}; For[n=1, n<210, n++, If[Prime[n+1]==Prime[n]+2, AppendTo[a, Prime[Prime[n]+1]]]]; a Prime[#+1]&/@Select[Partition[Prime[Range[300]], 2, 1], #[[2]]-#[[1]] == 2&][[All, 1]] (* Harvey P. Dale, Feb 27 2021 *) PROG (PARI) pipprimes(n) = { for(x=1, n, c=0; p1 = prime(prime(x)); p2 = prime(prime(x+1)); forprime(y=p1+2, p2-2, c++); if(c==1, forprime(y=p1+2, p2-2, print1(y", "); ); ) ) } CROSSREFS Sequence in context: A267985 A173230 A155036 * A022005 A281317 A336773 Adjacent sequences:  A088982 A088983 A088984 * A088986 A088987 A088988 KEYWORD nonn AUTHOR Cino Hilliard, Oct 31 2003 EXTENSIONS Edited by Stefan Steinerberger, Jul 27 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 20 21:24 EDT 2021. Contains 347590 sequences. (Running on oeis4.)