40501
domain: N
Appears in sequences
- Strong pseudoprimes to base 5.at n=12A020231
- Strong pseudoprimes to base 14.at n=14A020240
- Strong pseudoprimes to base 18.at n=22A020244
- Strong pseudoprimes to base 25.at n=26A020251
- Strong pseudoprimes to base 57.at n=25A020283
- Strong pseudoprimes to base 69.at n=22A020295
- Strong pseudoprimes to base 70.at n=26A020296
- Strong pseudoprimes to base 88.at n=18A020314
- Strong pseudoprimes to base 90.at n=13A020316
- Strong pseudoprimes to base 93.at n=24A020319
- Strong pseudoprimes to base 94.at n=16A020320
- Strong pseudoprimes to base 99.at n=25A020325
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 17.at n=33A051982
- Composite numbers k such that k divides F(k-1) where F(j) are the Fibonacci numbers.at n=14A069106
- Odd Fibonacci pseudoprimes: odd composite numbers k such that either (1) k divides Fibonacci(k-1) if k == +-1 (mod 5) or (2) k divides Fibonacci(k+1) if k == +-2 (mod 5).at n=26A081264
- a(n) = (6*n!/(n+5)) *binomial(n+5,n-1)* 6F6(-n+1, 1/5*n+1, 1/5*n+9/5, 1/5*n+8/5, 1/5*n+7/5, 1/5*n+6/5; 7/6, 4/3, 3/2, 5/3, 11/6, 2; -3125/46656), where 6F6(;;) is the generalized hypergeometric series.at n=4A090134
- Numbers k that divide Fibonacci(k-1) but do not divide Fibonacci(k) - 1.at n=8A094410
- 10-gonal numbers for which the sum of the digits is also a 10-gonal number.at n=14A119547
- Overpseudoprimes to base 5.at n=8A141390
- Number of n X n binary arrays with all ones connected only in a 1001-1001-1111 pattern in any orientation.at n=8A147405