27199

Appears in sequences

• Quadruple lucky numbers (lower terms). Numbers n such that n, n+2, n+6, n+8 are all Lucky numbers.at n=23A139783
• a(n) = 68*n^2 - 1.at n=19A158730
• Numbers n such that 5^n-6 is prime.at n=23A165701
• a(1) = greatest k such that H(k) - H(4) < 1/3 + 1/4; a(2) = greatest k such that H(k) - H(a(1)) < H(a(1)) - H(4); and for n > 2, a(n) = greatest k such that H(k) - H(a(n-1)) > H(a(n-1)) - H(a(n-2)), where H = harmonic number.at n=21A224868
• a(n) = 17*n^2 - 1.at n=40A321180
• Numbers k such that 365*2^k+1 is prime.at n=28A323007