1252815

Appears in sequences

• Numbers n such that for all divisors of n, ratios of 2 consecutive divisors of n will always reduce to lowest terms to a fraction with numerator=denominator+2.at n=39A280963
• a(n) = n^4 if n odd, 15*n^4/16 if n even.at n=34A309336
• a(n) = (n+1)*(n+2)/2 * (2^n + 1)^n.at n=4A326012
• Integers k such that k = Sum k/(p_i + j), where p_i are the prime factors of k (with multiplicity). Case j = -1.at n=20A380888