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A088988 Least prime that begins a run of exactly 2n-1 primes between two consecutive prime-indexed primes. 0
7, 19, 89, 463, 809, 1223, 619, 15727, 3767, 6907, 9109, 14197, 22109, 27103, 41057, 55009, 10937, 99559, 357829, 216649, 177797, 172213, 1040813, 327779, 375043, 219937, 423019, 1049177, 536281, 523571, 402769, 1155431, 2192123, 1792103 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..34.

FORMULA

a(n) = prime(1 + A000230(n)) = prime(1 + prime(A038664(n))).

EXAMPLE

5 and 11 are the 3rd and 5th primes; 7 begins a run of 1 primes.

17 and 31 are the 7rd and 11th primes; 19 begins a run of 3 primes.

PROG

(PARI) pipprimes(n, m) = { for(x=1, n, c=0; p1 = prime(prime(x)); p2 = prime(prime(x+1)); forprime(y=p1+2, p2-2, c++); if(c==m, forprime(y=p1+2, p2-2, print1(y", "); ); ) ) }

CROSSREFS

Sequence in context: A237436 A300556 A267378 * A109879 A109880 A245489

Adjacent sequences:  A088985 A088986 A088987 * A088989 A088990 A088991

KEYWORD

nonn

AUTHOR

Cino Hilliard, Oct 31 2003

EXTENSIONS

Extended and edited by T. D. Noe, Apr 14 2009

STATUS

approved

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Last modified October 26 06:08 EDT 2021. Contains 348257 sequences. (Running on oeis4.)