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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

Table of n, a(n) for n=1..5.

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

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Last modified August 7 19:57 EDT 2020. Contains 336279 sequences. (Running on oeis4.)