A117099 - OEIS

A117099

Numbers n such that nextprime(2*n)>2*nextprime(n) and n is composite (if p is prime then nextprime(p)=p).

4, 10, 12, 16, 22, 27, 28, 40, 42, 45, 46, 52, 57, 58, 60, 66, 70, 72, 82, 87, 88, 100, 102, 106, 108, 112, 126, 129, 130, 136, 147, 148, 150, 159, 160, 161, 162, 166, 169, 170, 171, 172, 177, 178, 180, 190, 192, 195, 196

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..49.

PROG

(PARI) for(i=1, 200, if(nextprime(2*i)>nextprime(2)*nextprime(i) && !isprime(i), print1(i, ", ")))

CROSSREFS

Sequence in context: A077654 A095275 A366530 * A026180 A109274 A071565

Adjacent sequences: A117096 A117097 A117098 * A117100 A117101 A117102

KEYWORD

easy,nonn

AUTHOR

Mohammed Bouayoun (mohammed.bouayoun(AT)sanef.com), Apr 18 2006

STATUS

approved