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A308270
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Smallest prime with E-irregularity index n.
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0
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OFFSET
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0,1
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COMMENTS
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Smallest prime p such that A308243(i) = n, where i is the index of p in A000040.
E-regular primes have E-irregularity index 0, so a(0) = 2, since 2 is the smallest E-regular prime (A092217).
Does such a prime exist for every n?
a(4) > 2003 if it exists.
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LINKS
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PROG
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a308243(n) = my(p=prime(n), e=2, i=0); while(e <= p-3, if(a000364(e)%p==0, i++); e=e+2); i
a(n) = for(x=1, oo, if(a308243(x)==n, return(prime(x))))
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CROSSREFS
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KEYWORD
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nonn,hard,more
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AUTHOR
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STATUS
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approved
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