24531

Appears in sequences

• Triangular numbers with sum of digits = 15.at n=31A068130
• Duplicate of A068804.at n=17A068709
• Triangular numbers whose digits can be rearranged to form a substring of 123456789012345678901234....at n=18A068804
• Triangular numbers such that the product of digits is also a (positive) triangular number.at n=15A069077
• Smallest triangular number containing all the digits of numbers from 1 to n.at n=4A069601
• Smaller of the two successive triangular numbers which differ in the use of only one digit.at n=39A077759
• Begin with n and place (n-1) on the most significant side, place (n-2) on the least significant side and so on until a 1 is placed.at n=4A089370
• Triangular numbers whose sum of squared digits is also triangular.at n=16A094890
• Triangular numbers equal to the difference between a prime number and its index.at n=38A115887
• Partial sums of dodecahedral numbers (A006566).at n=12A116689
• Number of permutations of length n which avoid the patterns 1234, 3412, 3421.at n=11A116824
• Hexagonal numbers for which the sum of the digits is also a hexagonal number.at n=24A117062
• Hexagonal numbers for which both the sum of the digits and the product of the digits are also hexagonal numbers.at n=14A117064
• Numbers which are both lucky and triangular.at n=40A118565
• Hexagonal numbers (A000384) which are sum of 2 other hexagonal numbers > 0.at n=21A133215
• Triangular numbers T such that T+2 is a prime.at n=41A171570
• Triangular numbers for which the product of the digits is a nonzero hexagonal number.at n=8A185211
• Number of all possible tetrahedra of any size, having reverse orientation to the original regular tetrahedron, formed when intersecting the latter by planes parallel to its sides and dividing its edges into n equal parts.at n=35A216172
• Triangular numbers which are an average of four consecutive primes.at n=21A226196
• Pyramidal centered square numbers.at n=10A237516