28650

Appears in sequences

• Triangle arising in enumeration of maps on projective plane.at n=14A058893
• First of triples of consecutive happy numbers, i.e., the first of three consecutive integers each of which is a happy number (A007770).at n=29A072494
• Numbers k such that k and k^2 use only the digits 0, 2, 5, 6 and 8.at n=33A136913
• a(1)=2. For n >=2, a(n) = the least integer >= a(n-1) that is not coprime to both a(n-1)+1 and a(n-1).at n=31A140525
• Smallest number k such that k^n is the sum of numbers in a twin prime pair.at n=26A195336
• Number of nondecreasing sequences of 4 1..n integers with no element dividing the sequence sum.at n=30A212871
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 437", based on the 5-celled von Neumann neighborhood.at n=34A272155
• Number of n X 3 0..2 arrays with no element equal to more than one of its king-move neighbors and with new values introduced in order 0 sequentially upwards.at n=9A280854
• a(n) = 28*2^n - 22.at n=10A305164
• a(0)=1; for n>0, a(n) is the number of rooted 3-regular maps with 2n vertices on the projective plane.at n=4A322928