43956

Appears in sequences

• Numbers k such that 2*3^k + 1 is prime.at n=30A003306
• Smallest triangular number which is a multiple (>1) of the n-th triangular number.at n=35A068084
• Triangular numbers which are products of triangular numbers larger than 1.at n=33A068143
• Triangular numbers such that the product of digits is also a (positive) triangular number.at n=18A069077
• Triangular numbers which are 7-almost primes.at n=18A076581
• a(n) = number of partitions of n wherein the sum of the 1's is no more than the sum of the other parts.at n=40A083690
• Numbers k for which the quotient q(k)=(k+rev(k))/abs(k-rev(k)) is an integer.at n=19A087993
• Numbers that have exactly seven prime factors counted with multiplicity (A046308) whose digit reversal is different and also has 7 prime factors (with multiplicity).at n=32A109027
• Non-palindromes in A110751; that is, non-palindromic numbers n such that n and R(n) have the same prime divisors, where R(n) = digit reversal of n.at n=11A110819
• Triangular numbers whose digit reversal is the product of 2 palindromes greater than 1.at n=35A115702
• Triangular numbers that are the product of 2 palindromes greater than 1.at n=30A115744
• Triangular numbers for which the sum of the digits is a cube.at n=14A117803
• Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, 1), (0, -1), (0, 1), (1, 0), (1, 1)}.at n=9A151460
• Numbers which can be expressed as the product of numbers made of only sixs.at n=17A161144
• Triangular numbers that are the product of two triangular numbers greater than 1.at n=23A188630
• Numbers whose square is the product of a number and its reverse.at n=18A207373
• Number of nX3 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it or three plus the sum of the elements diagonally to its northwest, modulo 4.at n=7A240188
• T(n,k)=Number of nXk 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or three plus the sum of the elements diagonally to its northwest, modulo 4.at n=52A240192
• Triangular numbers which have one or more occurrences of exactly five different digits.at n=34A241788
• Indices of records in A004290.at n=21A268610