25122

Appears in sequences

• Numbers k such that sigma(k) = sigma(k+8).at n=26A015876
• Convolution of Fibonacci numbers and A000201.at n=17A023611
• Numbers n such that A048767(n+1)=A048767(n).at n=25A048769
• Numbers k such that reverse(gpf(k)) = gpf(k+1), where gpf(n) = A006530(n); a(1)=1.at n=33A071844
• Concatenate n and the sum of factorials of the digits of n.at n=25A109016
• a(0)=1, a(n)=4a(n-1)+2 for n odd, a(n)=4a(n-1) for n even.at n=7A117614
• a(n) = 3*a(n-1)+n if a(n-1) is not divisible by 2, or a(n) = a(n-1)/2 otherwise.at n=69A135294
• Integers that do not have a partition into a sum of an odd square and two (not necessarily distinct) triangular numbers.at n=42A191764
• a(n) = (4*n+3)*(4*n+2).at n=39A256833
• Integers that are the sum of two consecutive semiprimes, as well as the product of two consecutive semiprimes.at n=9A288955
• Oblong numbers that are the sum of 2 successive primes.at n=35A298077
• Number of minimal total dominating sets in the n-gear graph.at n=17A303226
• The sum of the numbers on straight lines of incrementing length n when drawn over numbers of the square spiral, where each line contains numbers which sum to the minimum possible value, and each number on the spiral can only be in one line. If two or more lines exist with the same sum the one containing the smallest number is chosen.at n=31A340974
• Oblong numbers which are products of four distinct primes.at n=30A358988
• Semiperimeter of the unique primitive Pythagorean triple whose inradius is the n-th odd prime and whose short leg is an even number.at n=35A380301