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A076959 Number of primes between 3^n and 4^n. 1
0, 2, 9, 32, 119, 435, 1573, 5695, 20773, 76057, 279850, 1033937, 3837070, 14296494, 53468768, 200673056, 755606952, 2853697709, 10807617884, 41036410818, 156186010430, 595759180892, 2277112205791, 8720036044777, 33451314673521, 128533154571957 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..26.

FORMULA

a(n) = A086680(n) - A055729(n).

PROG

(PARI) a(n) = primepi(4^n) - primepi(3^n); \\ Michel Marcus, Mar 22 2015

CROSSREFS

Cf. A055729, A086680.

Sequence in context: A077644 A292482 A053369 * A003697 A006253 A045630

Adjacent sequences:  A076956 A076957 A076958 * A076960 A076961 A076962

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Oct 21 2002

EXTENSIONS

More terms from Ralf Stephan, Oct 31 2002

a(14)-a(26) added by David Baugh, Mar 22 2015

STATUS

approved

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Last modified November 15 18:59 EST 2019. Contains 329149 sequences. (Running on oeis4.)