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A300398 a(n) = number of primes that end in 3 among the first 10^n primes. 3
3, 26, 253, 2515, 25007, 250110, 2500209, 25000135, 250002220, 2500000243, 25000027724, 250000009260 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Caldwell and Honaker, Prime Curios!
FORMULA
a(n) = A185712(A006988(n)). - Michel Marcus, Mar 20 2018
EXAMPLE
a(1) = 3 because the first 10 primes are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, among which there are three primes ending in 3.
PROG
(PARI) a(n) = #select(x->((x % 10) == 3), primes(10^n)); \\ Michel Marcus, Mar 07 2018
CROSSREFS
Sequence in context: A067858 A052141 A062793 * A048861 A053972 A204561
KEYWORD
nonn,base,more
AUTHOR
G. L. Honaker, Jr., Mar 05 2018
EXTENSIONS
a(3)-a(8) from Chuck Gaydos
a(9) from Jon E. Schoenfield, Mar 20 2018
a(10)-a(12) from Giovanni Resta, Mar 27 2018
STATUS
approved

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)