A371622 -id:A371622

Search: a371622 -id:a371622

Displaying 1-2 of 2 results found.

page 1

A371651

a(n) is the first prime p such that p - 2 and p + 2 both have exactly n prime factors, counted with multiplicity.

+10
2

5, 23, 173, 2693, 32587, 495637, 4447627, 35303123, 717591877, 928090627, 69692326373, 745041171877, 5012236328123, 64215009765623, 945336806640623, 8885812685546873

(list; graph; refs; listen; history; text; internal format)

CROSSREFS

Cf. A001222. Contained in A371622.

A371656

Numbers k such that k - 2 and k + 2 have the same number of prime factors, counted with multiplicity.

+10
2

5, 8, 9, 10, 12, 15, 21, 23, 24, 36, 37, 38, 39, 45, 53, 58, 60, 67, 68, 69, 81, 84, 86, 89, 93, 99, 100, 102, 105, 110, 111, 112, 113, 117, 120, 121, 129, 131, 134, 138, 143, 144, 154, 157, 165, 172, 173, 178, 184, 185, 188, 195, 203, 204, 207, 211, 215, 216, 217, 219, 225, 230, 231, 240, 244

(list; graph; refs; listen; history; text; internal format)

CROSSREFS

Cf. A001222. Contains A371622.

page 1

Search completed in 0.005 seconds