19963

Properties

Appears in sequences

• Number of binary codes of length 5 with n words.at n=10A034190
• Number of binary codes of length 5 with n words.at n=22A034190
• Number of binary codes (not necessarily linear) of length n with 10 words.at n=4A034205
• Irregular triangle read by rows: T(n,k) = number of binary codes of length n with k words (n >= 0, 0 <= k <= 2^n); also number of 0/1-polytopes with vertices from the unit n-cube; also number of inequivalent Boolean functions of n variables with exactly k nonzero values under action of Jevons group.at n=46A039754
• Irregular triangle read by rows: T(n,k) = number of binary codes of length n with k words (n >= 0, 0 <= k <= 2^n); also number of 0/1-polytopes with vertices from the unit n-cube; also number of inequivalent Boolean functions of n variables with exactly k nonzero values under action of Jevons group.at n=58A039754
• Denominators of continued fraction convergents to sqrt(849).at n=10A042639
• Discriminants of imaginary quadratic fields with class number 17 (negated).at n=33A046014
• Revert transform of 2*x*(1 - x - x^3 + x^6)-x/(1+x).at n=8A049183
• Prime number spiral (clockwise, Northeast spoke).at n=24A054553
• Numbers n such that the number formed by the digits of 2n sorted in descending order is equal to the sum of the divisors of n after the digits of each divisor have been sorted in descending order (all zeros dropped).at n=6A083389
• Primes p that divide Fibonacci[(p+1)/7].at n=25A125252
• Records in A064844.at n=21A135987
• Primes congruent to 16 mod 61.at n=36A142814
• Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 01110-11111 pattern in any orientation.at n=14A147362
• Triangle read by columns: Distinct classifications of N elements containing exactly R binary partitions.at n=42A171872
• Mutual solutions to two classification counting problems: binary block codes of wordlength J with N used words; and classifications of N elements by J partitions.at n=25A171876
• Primes p such that q*p +- (p mod q) are primes, for q=8.at n=25A178416
• Primes whose base-3 representation also is the base-2 representation of a prime.at n=29A235265
• Primes that can be generated by the concatenation in base 6, in descending order, of two consecutive integers read in base 10.at n=12A287307
• Primes of the form k!3 + 3^9, where k!3 is the triple factorial number (A007661).at n=2A288885