40121

Appears in sequences

• Expansion of 1/((1-2x)(1-5x)(1-6x)(1-9x)).at n=4A025988
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 36.at n=4A031624
• 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=18A072610
• Numbers n such that prime(n) == -5 (mod n).at n=20A092047
• a(n) is the largest number m such that m = pi(n*m).at n=10A102281
• Numbers n such that prime(n) + prime(n+1) is divisible by 2n + 1.at n=5A278693
• Numbers k such that floor(prime(k)/k) < floor(prime(k+1)/(k+1)).at n=17A308082