24963

Appears in sequences

• a(n) = (4*n+1)*(4*n+3).at n=39A001539
• Numbers k such that k + 1 has one more divisor than k.at n=24A055927
• Squarefree numbers k with largest prime factor = floor(sqrt(k)).at n=26A071311
• Squarefree numbers of the form (prime(k)+1)*(prime(k+1)+1)/4.at n=13A079095
• Numbers of planar triangulations with minimum degree 5 and without separating 3-cycles - that is 3-cycles where the interior and exterior contain at least one vertex.at n=13A111357
• Numbers k such that 13*k = A048720(29,k), where A048720 is carryless base-2 multiplication.at n=53A115805
• Expansion of (1 + x) / (5*x^2 - 2*x + 1).at n=13A116483
• Numerator of imaginary part of (3*i - 1)^(-n).at n=13A124871
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (0, 0, -1), (0, 0, 1), (0, 1, 1), (1, 1, 1)}.at n=7A151213
• The odd composites c such that c=q*g*j*y/2 and q+g=j*y where q,g,j,y are distinct primes.at n=37A167629
• Number of tilings of a 16 X n rectangle using 2n octominoes of shape I.at n=25A250665
• Variation on Fermat's Diophantine m-tuple: 1 + the GCD of any two distinct terms is a square.at n=22A274697
• Products p*q*r of three distinct primes such that (p*q) mod r, (p*r) mod q and (q*r) mod p are all prime.at n=27A338704
• Starts of runs of 3 consecutive anti-tau numbers (A046642).at n=33A341780
• Numbers m such that abs(K(m+1) - K(m)) = 1, where K(m) = A002034(m) is the Kempner function.at n=26A346211
• a(n) = number of subsets S of {1,2,...,n} having more than 2 elements such that (sum of least two elements of S) = difference between greatest two elements of S.at n=19A357292
• Number of compositions of n that are anti-palindromic modulo 3.at n=19A362057
• Long leg of the only primitive Pythagorean triple whose inradius is the n-th odd prime and whose short leg is an even number.at n=35A367335
• Numbers k such that A011776(k) = A011776(k+1).at n=17A373725
• Numbers k >= 2 such that (S(k) - I(k)) / (k - 1) is an integer, where S(k) = Sum_{i=2..k} A007918(i) and I(k) = Sum_{i=2..k} A007917(i).at n=9A383358