login
A324207
Numbers with exactly seven distinct exponents in their prime factorization, or seven distinct parts in their prime signature.
1
2677277333530800000, 2992251137475600000, 3164055030536400000, 3501054974617200000, 3536296798834800000, 3622198745365200000, 3748188266943120000, 4015916000296200000, 4189151592465840000, 4207150095548400000, 4280780335431600000, 4373290124002800000, 4429677042750960000
OFFSET
1,1
LINKS
EXAMPLE
2677277333530800000 = 2^7 * 3^6 * 5^5 * 7^4 * 11^3 * 13^2 * 17 is in the sequence. There are exactly 7 distinct exponents; 1 through 7 in it.
PROG
(PARI) is(n) = #Set(factor(n)[, 2]) == 7
KEYWORD
nonn,easy
AUTHOR
David A. Corneth, Feb 17 2019
STATUS
approved