81619

Properties

Appears in sequences

• Numbers k such that k^2 contains exactly 2 distinct digits.at n=32A016069
• Numbers k such that k^2 contains exactly 2 different digits, excluding 10^m, 2*10^m, 3*10^m.at n=20A016070
• Primes that remain prime through 4 iterations of function f(x) = 4x + 3.at n=30A023311
• When squared gives number composed of digits {1,4,6}.at n=20A027677
• Primes p such that all digits of p^2 appear in p.at n=3A030083
• Numbers k such that k^2 contains only digits {1,2,6}.at n=8A053882
• Numbers k such that k^2 contains only digits {1,3,6}.at n=13A053892
• Numbers k such that k^2 contains only digits {1,5,6}.at n=11A053902
• Numbers k such that k^2 contains only digits {1,6,7}.at n=8A053906
• Numbers k such that k^2 contains only digits {1,6,8}.at n=8A053908
• Numbers k such that k^2 contains only digits {1,6,9}.at n=11A053910
• Prime numbers whose square is composed of just two different decimal digits.at n=5A057659
• Numbers k such that k^2 contains only digits {0,1,6}, not ending with zero.at n=5A058417
• Numbers k such that k and k^2 use only the digits 0, 1, 6, 8 and 9.at n=27A136879
• Numbers k such that k and k^2 use only the digits 1, 2, 6, 8 and 9.at n=12A137016
• Numbers k such that k and k^2 use only the digits 1, 3, 6, 8 and 9.at n=19A137041
• Numbers k such that k and k^2 use only the digits 1, 4, 6, 8 and 9.at n=21A137055
• Numbers k such that k and k^2 use only the digits 1, 5, 6, 8 and 9.at n=8A137062
• Numbers k such that k and k^2 use only the digits 1, 6, 7, 8 and 9.at n=8A137065
• Primes of the form 2*n^2 + 58*n + 27.at n=33A217498