67947

Appears in sequences

• Third column of triangle A060058.at n=8A060060
• Smallest k not a palindrome and not divisible by 10 such that k and R(k) (A004086) both are divisible by the n-th prime.at n=19A075605
• Numbers which are both lucky and pentagonal.at n=16A128511
• Number of (n+1) X (1+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2 X 2 subblock equal.at n=5A237802
• Number of (n+1) X (6+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2 X 2 subblock equal.at n=0A237807
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2X2 subblock equal.at n=15A237809
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2X2 subblock equal.at n=20A237809
• Where records occur in A239866.at n=13A239867
• Consider a number n with m decimal digits. The sequence lists the numbers n having the prefix of length m-1 in the middle of the decimal expansion of n^2.at n=18A242942
• Numbers n such that the decimal expansion of n^2 contains n+1.at n=12A282384
• a(n) = (A001359(n+1)^2 - 1)/24, where A001359 = lesser of twin primes; or: pentagonal numbers (A000326) whose indices are twin ranks (A002822).at n=41A308344
• Integers m such that A014448(m) == 1 (mod m).at n=12A335722
• a(n) is the index of the smallest n-gonal pyramidal number with binary weight n.at n=36A359092
• Pentagonal numbers which are products of four distinct primes.at n=34A381919
• a(n) = Sum_{k=0..floor(n/3)} binomial(n,k) * binomial(n-1,n-3*k).at n=12A389328