40078

Appears in sequences

• Numbers n such that prime(n) mod n <= 10.at n=53A022465
• Numbers k such that prime(k) == 5 (mod k).at n=7A023147
• All 81 combinations of prefixing and following a(n) by a single digit are nonprime.at n=29A032734
• a(n) cannot be prefixed or followed by any digit to form a prime ('empty' prefixes allowed).at n=7A032736
• Composite numbers k such that all the decimal concatenations ik and ikj (i, j = 1...9) are also composite.at n=19A032737
• a(n) cannot be prefixed or followed by any digit to form a prime ('empty' prefixes and suffixes are allowed).at n=5A032738
• Number of solutions to x*frac[p(x)/x]<=Log[n] or A004648(n)<=Log[n].at n=28A099641
• Number T(n,k) of squares of size k^2 in all tilings of an n X n square using integer-sided square tiles; triangle T(n,k), n >= 1, 1 <= k <= n, read by rows.at n=16A226936
• Number of ways to partition digits 0-9 into signed terms in decreasing absolute value order with sum n.at n=0A389952