31638

Appears in sequences

• Pentanacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4) + a(n-5) for n>4 and with a(0)=-2, a(1)=-1, a(2)=0, a(3)=1, a(4)=2.at n=20A135055
• Indices k such that A019326(k)=Phi[k](8) is prime, where Phi is a cyclotomic polynomial.at n=37A138938
• Number of 7 X 7 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.at n=20A156392
• Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 20.at n=5A156473
• Periods associated with A217611.at n=40A217646
• Numbers that are the sum of 10 consecutive primes and also the sum of 10 consecutive semiprimes.at n=6A284102