27612

Appears in sequences

• Star of David matchstick numbers: a(n) = 6*n*(3*n+1).at n=39A045946
• a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = n - 1 - 2^p and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 3, and a(3) = 1.at n=15A049966
• Numbers k for which 8*k+1, 8*k+5, 8*k+7 and 8*k+11 are primes.at n=32A123983
• Least magic constant of magic squares using Smith numbers.at n=10A170928
• Permutation of natural numbers: a(n) = A048673(A244319(n)).at n=47A245610
• Number of n X 3 0..1 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.at n=11A280549
• Number of enriched identity p-trees of weight n.at n=13A331875