21737

Properties

Appears in sequences

• Sum of 11 positive 9th powers.at n=16A004800
• Number of n X n symmetric positive semi-definite matrices with 2's on the main diagonal and 1's and 0's elsewhere.at n=5A085658
• Numbers such that the sum of the factorials of the digits of the fourth power is a square.at n=32A126077
• Prime numbers p such that p - 1 is the fourth a-figurate number and nineteenth b-figurate number for some a and b.at n=20A144327
• Primes p such that p^3 - 24 and p^3 + 24 are also primes.at n=38A153323
• Primes of the form 8*n^2 + 2*n + 1.at n=24A188382
• Primes p such that 10*p-1, 10*p-3, 10*p-7 and 10*p-9 are all prime.at n=13A243408
• Primes p such that 2*p^2 + 3 and 2*p^2 + 5 are also primes.at n=21A247197
• Prime numbers p such that p^3 is an interprime = average of two successive primes.at n=33A248799
• Primes equal to a centered 9-gonal number plus 1.at n=18A285812
• Prime numbers in A317298.at n=25A306362
• Primes p such that exactly four numbers among all circular permutations of the digits of p are prime.at n=23A344628
• Prime numbersat n=2438