133200

Appears in sequences

• Becomes prime after n iterations of f(x) = sigma(x)-1 (least inverse of A039655).at n=29A039656
• n written efficiently in natural numbers base, i.e., in form ...wxyz where n =1*z + 2*y + 3*x + 4*w + ... with z < 1, y < 2, x < 3, w < 4, ...at n=37A055992
• Numbers containing squares of Pythagorean triples in their divisor set.at n=36A096472
• Number of reduced 3 X 3 magilatin squares with largest entry n.at n=29A174018
• Numbers with prime factorization pq^2r^2s^4.at n=20A190319
• Numbers k such that k+1, 2k+1, 3k+1, 4k+1 are all prime.at n=32A237189
• List of numbers n such that A039654(n) reaches a new record high.at n=42A292113
• List of numbers n such that A039655(n) reaches a new record high.at n=14A292114
• Coreful triperfect numbers: numbers k such that csigma(k) = 3*k, where csigma(k) is the sum of the coreful divisors of k (A057723).at n=10A364990
• Inverse permutation to A386932.at n=46A387024
• Exponential abundant numbers that are not exponential unitary abundant.at n=18A391085
• Exponential Zumkeller numbers that are not exponential unitary Zumkeller numbers.at n=21A391090