23670

Appears in sequences

• a(n) = (d(n)-r(n))/2, where d = A026046 and r is the periodic sequence with fundamental period (0,1,0,1).at n=48A026047
• Difference between larger and smaller terms of n-th amicable pair.at n=13A066539
• 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, 0), (-1, 0, 1), (0, 1, -1), (1, -1, 1), (1, 0, 1)}.at n=9A148945
• Difference between sum of largest parts and sum of smallest parts of all partitions of n into an even number of parts.at n=30A211881
• Averages q of twin prime pairs, such that q concatenated to q is also the average of a twin prime pair.at n=29A235109
• Numbers k such that k is the average of four consecutive primes k-7, k-1, k+1 and k+7.at n=25A258879
• Difference between the larger and smaller terms of the n-th amicable pair (x,y) given in A259933.at n=13A275469
• Triangle T(n,k) read by rows: coefficients of polynomials P_n(t) defined in Formula section.at n=25A286800
• Number T(n,k) of colored integer partitions of n using all colors of a k-set such that a color pattern for part i has i distinct colors in increasing order; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=50A327117
• Triangle read by rows. T(n, k) = BellPolynomial(n, -k).at n=41A350263