251741

Appears in sequences

• Numbers k such that prime(k) == 9 (mod k).at n=12A023151
• Values of transition of A072608(n) from alternating behavior (0,1,0,1,..) into steadily-1 (1,1,1,..) behavior or changing back. Expressing in terms of A072609(n): at n values it switches from steadily 0 into steadily 1 successive values or back.at n=27A072610
• Numbers k such that A068902(k+1) <= A068902(k).at n=11A283053
• a(n) is a decimal number k having a length n binary expansion which encodes, from left to right at digit j, the coprimality (0) or non-coprimality (1) of j to n, for 1 < j <= n, except for the first digit, which is always 1.at n=17A306388