19438

Appears in sequences

• Numbers k such that 6!*(2*k-7)!/(k!*(k-1)!) is an integer.at n=23A004786
• Numbers k such that 7!*(2k-8)!/(k!*(k-1)!) is an integer.at n=26A004787
• Starting index of a string of 4 or more consecutive equal digits in decimal expansion of Pi.at n=17A049516
• Starting index of a string of exactly 4 consecutive equal digits in decimal expansion of Pi.at n=12A049520
• Numbers n such that the trinomial x^n + x + 1 is irreducible over GF(7).at n=12A058857
• Starting positions of strings of three 9's in the decimal expansion of Pi.at n=18A083642
• Binomial transform of [1, 2, 3, 4, 0, 0, 0, ...].at n=31A139488