68131

Appears in sequences

• Expansion of 1/(1-2*x+x^2+2*x^3).at n=22A077942
• Expansion of 1/(1+2*x+x^2-2*x^3).at n=22A077989
• Start with 1 and repeatedly reverse the digits and add 65 to get the next term.at n=27A118163
• Numbers k such that k and k^2 use only the digits 1, 3, 4, 6 and 8.at n=16A137026
• Number of factorizations of m^n into 3 factors, where m is a product of exactly 3 distinct primes and each factor is a product of n primes (counted with multiplicity).at n=41A257464
• Number of sets of exactly n positive integers <= n+8 having a square element sum.at n=19A281971
• Expansion of (E_4(q) - 28*E_4(q^2) + 63*E_4(q^3) - 36*E_4(q^6)) / 240.at n=26A288485
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + n*b(n-1), where a(0) = 1, a(1) = 2, b(0) = 3, b(1) = 4, and (a(n)) and (b(n)) are increasing complementary sequences.at n=17A296288
• Numbers that are the sum of seven fourth powers in exactly ten ways.at n=31A345832