22230

Appears in sequences

• Composite numbers k such that the difference between the odd and even aliquot parts of k divides k.at n=25A066193
• Final members of groups in A076105.at n=36A076102
• Expansion of (1-x)/(1-x+2*x^2+x^3).at n=23A078021
• Sequence A014486 shown in base 4.at n=24A085185
• Numbers whose number of divisors equals the sum of their separate prime-power decompositions.at n=11A087004
• Period of the Lucas 4-step sequence A073817 mod n.at n=41A106295
• Smallest number m such that m has exactly n distinct prime factors and sigma(m) has exactly n distinct prime factors.at n=4A152617
• Limit_{n->oo} M^n as a vector, where M is A173108 as an infinite lower triangular matrix.at n=9A173110
• Smallest multiple of n whose factorial digit sum equals n.at n=12A191895
• Row sums of an irregular triangle read by rows in which row n lists the next A026741(n+1) natural numbers A000027.at n=37A195309
• Numbers such that the sum of the largest and the smallest prime divisor equals the sum of the other distinct prime divisors.at n=34A199745
• Triangle of coefficients of polynomials v(n,x) jointly generated with A207608; see Formula section.at n=59A207609
• a(n) = Sum_{i=1..n} (3i)^2.at n=19A220443
• Triangle read by rows: coefficients of third-order hypergeometric-harmonic polynomials.at n=25A222063
• a(n) = 9*binomial(8*n + 9,n)/(8*n + 9).at n=4A234467
• a(n) = n*(7*n^2 + 15*n + 8)/6.at n=26A245301
• Number of (n+2) X (6+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 3 5 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 3 5 6 or 7.at n=13A252382
• Triangle read by rows: T(n,k) = number of partial idempotent mappings (of an n-chain) with (right) waist exactly k.at n=49A258579
• Sum of primes between 100*n and 100*n + 99.at n=18A276355
• Numbers that are product of a second hexagonal number (A014105) and a square pyramidal numbers (A000330) in at least two ways.at n=10A306122