306153
domain: N
Appears in sequences
- Triangular numbers containing 2k digits in which the sum of the first k digits = that of the rest.at n=31A068898
- Numbers k such that 2^k + 11 is prime.at n=30A102633
- a(n) = smaller member of n-th pair of distinct, positive, triangular numbers whose sum and difference are also triangular numbers.at n=15A185129
- Triangular numbers obtained as the concatenation of 2*k and k.at n=5A226742
- Triangular numbers whose binary conversion, read in decimal, is prime.at n=23A227028
- Triangular numbers n such that sigma(n) is a square number.at n=20A256151
- Numbers that start a run of four consecutive triangular numbers with four distinct prime factors.at n=31A349773