98048

Appears in sequences

• Number of occurrences of pattern 2-1 after n iterations of morphism A007413.at n=8A093357
• Admirable numbers such that the subtracted divisor is square.at n=19A109806
• Numbers n such that n and its 10's complement are both admirable numbers, i.e., n and 10^k - n where k is the number of digits in n are admirable.at n=5A110019
• Numbers k such that phi(k) + sigma(k) = (5/2)*k.at n=6A115747
• Expansion of g.f. x*(1+x+2*x^2+2*x^3+5*x^4+5*x^5-3*x^6+2*x^7-x^8-x^9)/(1-6*x^6-x^12).at n=39A116559
• Expansion of g.f. x*(1+x+2*x^2+2*x^3+5*x^4+5*x^5-3*x^6+2*x^7-x^8-x^9)/(1-6*x^6-x^12).at n=40A116559
• Abundant numbers n such that n/(sigma(n)-2n) is an integer.at n=34A153501
• Abundant numbers n for which the abundance d = sigma(n) - 2*n is a proper divisor, that is, 0 < d < n and d | n.at n=32A181595
• Near-perfect numbers (A181595) of the form 2^(t-1)*(2^t-2^k-1), where 2^t-2^k-1 is prime, k>=1, t>k.at n=16A181701
• a(n) = 6*a(n-2) + a(n-4), where a(0) = 3, a(1) = 11, a(2) = 18, a(3) = 68.at n=11A228470
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 22", based on the 5-celled von Neumann neighborhood.at n=8A269716
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 161", based on the 5-celled von Neumann neighborhood.at n=16A286166
• Numbers k whose abundance is 128: sigma(k) - 2*k = 128.at n=7A292626
• Numerators of continued fraction convergents to sqrt(10)/2 = sqrt(5/2) = A020797 + 1.at n=19A295333
• Three-column array pPT read by rows: subsequence of primitive Pythagorean triples (x, y, z) with x = A153893^2 - A000079^2, y = 2*A153893*A000079, z = A153893^2 + A000079^2, ordered by increasing z.at n=22A334638