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A092064 Prime numbers in A092063. 1
2, 3, 7, 19, 31, 79, 89, 137, 149, 181 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..10.

PROG

(PARI) f(n)= s=0; for(i=1, n, s=s+1/(prime(i)-1)); return(s); for (i=1, 500, if(isprime(f(i) && isprime(numerator(f(i))), print1(i, ", ")));

CROSSREFS

Sequence in context: A244638 A113165 A128025 * A152609 A298943 A172461

Adjacent sequences:  A092061 A092062 A092063 * A092065 A092066 A092067

KEYWORD

hard,nonn

AUTHOR

Mohammed Bouayoun (mohammed.bouayoun(AT)sanef.com), Feb 20 2004

STATUS

approved

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Last modified January 18 23:05 EST 2019. Contains 319282 sequences. (Running on oeis4.)