19445

Appears in sequences

• Indices of primes in sequence defined by A(0) = 77, A(n) = 10*A(n-1) - 3 for n > 0. Numbers n such that (690*10^n + 3)/9 is prime.at n=9A056260
• a(n) = a(n-1) + a(n - 1 minus the number of terms of a(k) == (mod 4) so far).at n=34A060731
• a(n) = least k such that the remainder when 23^k is divided by k is n.at n=47A128363
• Number of permutations in S_n avoiding {bar 1}3245 (i.e., every occurrence of 3245 is contained in an occurrence of a 13245).at n=8A137543
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (0, 0, -1), (0, 1, 0), (1, 0, 0), (1, 1, 1)}.at n=7A151145
• Numbers k such that 2^k + 2*k + 1 is prime.at n=14A301634
• Number of multisets of positive integers whose right half (exclusive) sums to n.at n=25A360673