78127

Appears in sequences

• Numbers that are the sum of 3 positive 7th powers.at n=20A003370
• Numbers that are the sum of at most 3 positive 7th powers.at n=37A004865
• Numbers k such that 5^k == -1 (mod k-1).at n=8A055688
• Start with 1 and repeatedly reverse the digits and add 42 to get the next term.at n=37A118075
• Numbers k that divide 5^k + 2.at n=3A123062
• (0, 1, 2, 3, 2^2, 5, 2*3, 7, 2^3, 3^2, 2*5, 11, 2^2*3, 13, ...) becomes (0^1 + 2, 3^2 + 2, 5^2 + 3, 7^2 + 3, 3^2 + 2, 5^11 + 2, 2^3 + 13, ...).at n=21A143651
• a(n) = a(n-1) + a(n-2) - floor( a(n-1)/2 ).at n=43A173510
• Minimal number (in decimal representation) with n nonprime substrings in base-5 representation (substrings with leading zeros are considered to be nonprime).at n=34A217105
• a(n) = 5^n + 2.at n=7A242328
• Numbers k such that 4^k + 19 is prime.at n=11A253774
• Square array T(n,k), n >= 1, k >= 1, read by antidiagonals downwards, where T(n,k) = Sum_{j=1..n} floor(n/(2*j-1))^k.at n=59A350122