37675

Appears in sequences

• Triangular numbers with sum of digits = 28.at n=7A068132
• Row sums of triangle A093922.at n=20A093925
• Numbers n such that phi(phi(n)) + sigma(sigma(n)) is a 4th power.at n=24A172464
• Denominators of signed Egyptian fractions 1/(1+2*a(n)) with sums converging to 2.at n=2A226128
• Triangular numbers which become primes when their rightmost digit is removed.at n=34A227936
• Sequence of distinct least positive triangular numbers such that the arithmetic mean of the first n terms is also a triangular number. Initial term is 1.at n=18A236416
• Expansion of x^2*(10-5*x+x^2)/((1-x)^4*(1-x^2)).at n=22A331429
• Triangular numbers that in base 2 have the same number of 0's and 1's.at n=20A345348
• Coefficient of x^n in the expansion of ( (1+x) / (1-x^3)^3 )^n.at n=9A370216