A167428 - OEIS

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A167428

Smallest non-isolated (or twin) prime > n-th non-isolated nonprime.

3, 3, 11, 11, 11, 17, 17, 17, 29, 29, 29, 29, 29, 29, 29, 29, 41, 41, 41, 41, 41, 41, 41, 41, 59, 59, 59, 59, 59, 59, 59, 59, 59, 59, 59, 59, 59, 71, 71, 71, 71, 71, 71, 71, 71, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	LINKS	`Table of n, a(n) for n=1..64.`
	EXAMPLE	`a(1)=3 (>0); a(2)=3 (>1); a(3)=11 (>8); a(4)=11 (>8); a(5)=11 (>10); a(6)=17 (>14).`
	MAPLE	`A164276 := proc(n) option remember; if n = 1 then 0; else for a from procname(n-1)+1 do if isA164276(a) then return a; end if; end do; end if: end proc:` `isA164276 := proc(n) not isprime(n) and ( not isprime(n+1) or not isprime(n-1) ) ; end proc:` `isA001097 := proc(n) isprime(n) and ( isprime(n+2) or isprime(n-2) ); end proc:` `A167428 := proc(n) for a from A164276(n)+1 do if isA001097(a) then return a; end if; end do: end proc:` `seq(A167428(n), n=1..120) ; # R. J. Mathar, May 30 2010`
	CROSSREFS	`Cf. A001097, A164276.` `Sequence in context: A122167 A095019 A321082 * A318961 A309798 A068594` `Adjacent sequences: A167425 A167426 A167427 * A167429 A167430 A167431`
	KEYWORD	`nonn`
	AUTHOR	`Juri-Stepan Gerasimov, Nov 03 2009`
	EXTENSIONS	`Entries checked by R. J. Mathar, May 30 2010`
	STATUS	`approved`

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Last modified May 21 09:30 EDT 2022. Contains 353908 sequences. (Running on oeis4.)