OFFSET
1,1
COMMENTS
There are A261571(18) = 948729 possible patterns for centuries having 18 primes.
LINKS
Brian Kehrig, Table of n, a(n) for n = 1..39 (terms up to 10^16)
Note (Apr 24 2024): An older version of the b-file missed a(33) and a(38). The present b-file is correct.
EXAMPLE
1228537713709 is in the sequence because there are 18 primes between 122853771370900 and 122853771370999: 122853771370900 + x, where x is one of (1, 3, 7, 19, 21, 27, 31, 33, 37, 49, 51, 61, 69, 73, 87, 91, 97, or 99).
PROG
(PARI) isok(k) = sum(i=0, 99, isprime(100*k + i)) == 18; \\ Michel Marcus, Mar 23 2023
CROSSREFS
Cf. A261571 (number of patterns for centuries with n primes).
KEYWORD
nonn
AUTHOR
Brian Kehrig, Mar 21 2023
STATUS
approved