35343

Appears in sequences

• Odd integers m such that phi(m) | sigma(m).at n=18A015715
• a(n) is the (n+1)st (n+2)-gonal number.at n=41A064808
• Numbers n such that the arithmetic, geometric and harmonic means of phi(n) and sigma(n) are all integers.at n=19A065146
• Numbers k such that sigma(k) = 4*phi(k).at n=15A068390
• Numbers k such that sigma(k) = phi(k)*omega(k).at n=10A073567
• Numbers k such that both k and 2*k are balanced numbers (A020492).at n=27A076375
• Numbers k such that k, 2*k and 4*k are balanced numbers (A020492).at n=11A076376
• Numbers k such that k, 2*k, 4*k and 8*k are balanced numbers (A020492).at n=3A076377
• a(n) = binomial(n+2,2)*binomial(n+6,2).at n=16A104473
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+833)^2 = y^2.at n=36A129010
• a(n) = (8*n+3)*(8*n+5).at n=23A177065
• 1/4 the number of n X n 0..3 symmetric matrices with every element equal to zero, one or four horizontal and vertical neighbors.at n=3A211087
• Number of superdiagonal bargraphs with area n.at n=36A219282
• Let f(x) be the absolute value of the difference between x and its base-2 reversal. Let g(x) be the number of times f(x) must be applied to x for the result to be 0. a(n) is the smallest value of x for which g(x) is n.at n=11A259658
• Integers n such that sigma(n)/phi(n) is a perfect square.at n=29A293391
• Starts of runs of 3 consecutive Niven numbers in base 2 (A049445).at n=15A330932
• Starts of runs of 3 consecutive anti-tau numbers (A046642).at n=39A341780
• a(n) = Sum_{k=0..floor(n/3)} (-1)^k * binomial(2*n+2,n-3*k).at n=8A371820