22969

Appears in sequences

• Gaps of 10 in sequence A038593 (upper terms).at n=13A038660
• Number of distinct partitions of triangular numbers n*(n+1)/2 into 3 parts for n>=1.at n=31A104385
• Semiprimes in A003215.at n=37A113530
• a(n) = n * Fibonacci(n) - Sum_{i=0..n} Fibonacci(i).at n=17A122491
• Number of partitions of 12*n into parts < 5.at n=12A191593
• The least nonsquare number s having exactly n twos in the periodic part of the continued fraction of sqrt(s).at n=43A206582
• The least number s > 1 having exactly n fives in the periodic part of the continued fraction of sqrt(s).at n=20A206585
• Number of partitions of 4n into 4 parts.at n=36A238340
• Number T(n,k) of ways k L-tiles can be placed on an n X n square; triangle T(n,k), n>=0, 0<=k<=A229093(n), read by rows.at n=33A243608
• Number of ways four L-tiles can be placed on an n X n square.at n=7A243647
• Concatenation of n-th prime and n-th nonprime.at n=49A253910
• Numbers such that A279966(n) = 0.at n=42A278436
• a(n) = n*(n + 5)*(n + 7)*(n + 10)/24 + 1.at n=22A323220
• a(n) is the permanent of the symmetric Toeplitz matrix of order n whose element (i,j) equals the |i-j|-th prime or 1 if i = j.at n=5A374067
• Squarefree semiprimes k such that k+1 is the product of three distinct primes and k+2 is the product of four distinct primes.at n=33A376352
• G.f. A(x) satisfies A(x) = (1 + x*A(x)^4) * C(x*A(x)^2), where C(x) is the g.f. of A000108.at n=5A381784