120917

Properties

Appears in sequences

• Primes p such that 54*p-1, 54*p+1 and 60*p-1, 60*p+1 are twin primes.at n=13A138698
• Numbers n such that there is no other number k for which A155043(k) = A155043(n).at n=21A262509
• Parent nodes of nonzero terms of A262509: a(n) = A049820(A262509(n)).at n=21A262510
• Number of 4 X n 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=14A302637
• Primes p such that p+2, (p^2-1)/2+p and (p^2+3)/2+3*p are also prime.at n=33A352948
• Prime numbersat n=11381