18767

Appears in sequences

• Numbers whose set of base-11 digits is {1,3}.at n=38A032918
• a(n) = prime(n)*prime(n+1) - prime(n) - prime(n+1).at n=32A037165
• a(n) = prime(n)^2 - 2.at n=32A049001
• 2*JacobiSymbol(p,5) mod p^2 for p=prime(n).at n=32A113651
• Expansion of 1/(1-x-x^2-x^6).at n=20A120400
• Subset of A037165 (p(n)*p(n+1)-p(n)-p(n+1)) for twin primes.at n=10A137367
• Number of different strings of length n+6 obtained from "123...n" by iteratively duplicating any substring.at n=8A137739
• Number of n X n binary arrays with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation.at n=6A146144
• Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation.at n=14A146146
• Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation.at n=15A146146
• Number of (n+2) X 3 binary arrays with each 3 X 3 subblock having rows and columns in lexicographically nondecreasing order.at n=37A184540
• a(n) = 7*a(n-1) - 14*a(n-2) + 7*a(n-3), a(0)=0, a(1)=1, a(2)=5.at n=8A215008
• Expansion of 1/(1 -x -x^2 -x^6 -x^24 - ... -x^(k!) - ... ).at n=20A217283
• Numbers k such that 3*10^k + 77 is prime.at n=20A293826
• Numbers n for which A325565(n) < A325568(n).at n=44A325569
• Starts of runs of 3 consecutive integers whose exponent of least prime factor in their prime factorization is even.at n=34A365871
• Numbers of the form Product_{k=i..j} prime(k) - Sum_{k=i..j} prime(k) where i < j.at n=46A387946