21663

Appears in sequences

• Number of Barlow packings with group P3(bar)m1(S) that repeat after 2n layers.at n=17A011951
• a(n) = T(n,m) + T(n,m+1) + ... + T(n,n), m=[ (n+1)/2 ], T given by A026769.at n=14A026891
• Number of inequivalent (ordered) solutions to n^2 = sum of 8 squares of integers >= 0.at n=41A065462
• Numbers n such that p = n^2 + 2, p+2 and p+6 are consecutive primes.at n=30A086380
• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 101-111-101 pattern in any orientation.at n=19A146433
• 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), (-1, 0, 0), (-1, 1, -1), (1, -1, -1), (1, 0, 1)}.at n=10A148542
• a(n) is the smallest number such that a(n)*n is an anagram of a(n)*5.at n=36A175694
• Numbers k such that there is 1 prime between 100*k and 100*k + 99.at n=23A186393
• Fixed points of permutations A262323 and A262255.at n=14A262367
• Denominators of r-Egyptian fraction expansion for 1/Pi, where r(k) = 1/(k+1).at n=3A270585
• Number of integer partitions of n with biquanimous multiplicities.at n=43A371839