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A386968

Numbers that can be written in exactly four ways as s_1^x_1 + ... + s_t^x_t, with 1 < s_1 < ... < s_t and {s_1,..., s_t} = {x_1,..., x_t} for some t > 0.

331979, 536134, 602342, 848707, 1007017, 1360430, 1484182, 1767157, 1891086, 2024074, 2036922, 2095031, 2097159, 2231826, 2257754, 2292303, 2293830, 2320578, 2440812, 2503676, 2590739, 2744591, 2852016, 2890344, 2914526, 2944901, 2951290, 3019920, 3020295, 3053910, 3121946, 3157114, 3310022

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

David A. Corneth, Table of n, a(n) for n = 1..3353 (terms <= 10^8)

EXAMPLE

331979 = 2^15 + 4^5 + 5^6 + 6^7 + 7^4 + 15^2

= 2^2 + 3^8 + 4^9 + 5^3 + 8^4 + 9^5

= 2^5 + 3^10 + 4^9 + 5^2 + 9^3 + 10^4

= 2^6 + 3^10 + 4^9 + 5^5 + 6^2 + 9^4 + 10^3.

536134 = 2^6 + 3^12 + 4^3 + 5^5 + 6^4 + 12^2

= 2^16 + 3^10 + 4^9 + 5^7 + 6^6 + 7^5 + 9^4