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Name First elements Short description OEIS Mersenne prime exponents : 2, 3, 5, 7, 13, 17, 19, 31, 61, 89, ... Primes p such that 2 p − 1 is prime.: A000043 ...
2, 4, 16, 64, 4096, 65536, 262144, 1073741824, ... (sequence A019279 in the OEIS). To illustrate: it can be seen that 16 is a superperfect number as σ(16) = 1 + 2 + 4 + 8 + 16 = 31, and σ(31) = 1 + 31 = 32, thus σ(σ(16)) = 32 = 2 × 16. If n is an even superperfect number, then n must be a power of 2, 2 k, such that 2 k+1 − 1 is a ...
The only known powers of 2 with all digits even are 2 1 = 2, 2 2 = 4, 2 3 = 8, 2 6 = 64 and 2 11 = 2048. [12] The first 3 powers of 2 with all but last digit odd is 2 4 = 16, 2 5 = 32 and 2 9 = 512. The next such power of 2 of form 2 n should have n of at least 6 digits.
n 4 = n × n × n × n. Fourth powers are also formed by multiplying a number by its cube. Furthermore, they are squares of squares. Some people refer to n 4 as n tesseracted, hypercubed, zenzizenzic, biquadrate or supercubed instead of “to the power of 4”. The sequence of fourth powers of integers, known as biquadrates or tesseractic ...
4095 – triangular number [2] and odd abundant number; [9] number of divisors in the sum of the fifth and largest known unitary perfect number, largest Ramanujan–Nagell number of the form [10] 4096 = 64 2 = 16 3 = 8 4 = 4 6 = 2 12 , smallest number with exactly 13 factors, a superperfect number [ 11 ]
Get ready for all of today's NYT 'Connections’ hints and answers for #610 on Monday, February 10, 2025. Today's NYT Connections puzzle for Monday, February 10, 2025 The New York Times
4 Down: The Browns, on N.F.L. scoreboards — HINT: It starts with the letter "C" 5 Down: Cook in the pan — HINT: It ends with the letter "Y" Answers to NYT's The Mini Crossword for Sunday ...
Get ready for all of today's NYT 'Connections’ hints and answers for #607 on Friday, February 7, 2025. Today's NYT Connections puzzle for Friday, February 7, 2025 The New York Times