A108249 - OEIS

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A108249

Consider primes p and q such that p = 3^k + 20 and q = 3^(k+1) + 20 for some k; sequence gives values of p.

23, 29, 47, 101, 2207, 59069 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	LINKS	`Table of n, a(n) for n=1..6.`
	EXAMPLE	`3^1 + 20 = 23, 3^2 + 20 = 29.`
	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. A108258.` `Sequence in context: A108111 A085713 A102904 * A232725 A045120 A174260` `Adjacent sequences: A108246 A108247 A108248 * A108250 A108251 A108252`
	KEYWORD	`nonn`
	AUTHOR	`Cino Hilliard, Jun 29 2005`
	STATUS	`approved`

Last modified July 11 14:30 EDT 2020. Contains 335626 sequences. (Running on oeis4.)