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A282783 Number of terms in A282430 less than or equal to 10^n. 0
0, 1, 1, 6, 77, 1069, 13041, 153389, 1691609, 18175623, 192338138 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
COMMENTS
An approximate value of a(n) is given by C*10^n*(exp(-2) - 1/log(10^n)), where C = 0.209.
LINKS
PROG
(PARI) a(n)={t=0; forstep(m=2, 10^n, 2, if(!(m%3)==0, x=0; until(p<2||isprime(p), p=m-3^x; x++); if(p<2, t++))); return(t)};
CROSSREFS
Cf. A282430.
Sequence in context: A082629 A278365 A154642 * A215551 A154645 A299434
KEYWORD
nonn,more
AUTHOR
STATUS
approved

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)