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!)
 A108273 Consider primes p and q such that p = 2^k + 21 and q = 2^(k+1) + 21 for some k; sequence gives values of q. 1
 37, 53, 277, 65557, 4503599627370517 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS MATHEMATICA Select[Partition[2^Range[100]+21, 2, 1], AllTrue[#, PrimeQ]&][[All, 2]] (* Harvey P. Dale, Jan 17 2021 *) PROG (PARI) g(m, n, b) = { for(x=0, n, y=m+b^x+b%2; z=m+b^(x+1)+b%2; if(isprime(y)&isprime(z), print1(y", ") ) ) } CROSSREFS Cf. A108272. Sequence in context: A242930 A139918 A289510 * A045223 A134222 A179150 Adjacent sequences:  A108270 A108271 A108272 * A108274 A108275 A108276 KEYWORD nonn AUTHOR Cino Hilliard, Jun 29 2005 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 June 19 15:47 EDT 2021. Contains 345142 sequences. (Running on oeis4.)