id:A115103 - OEIS Search Results

Search: id:A115103

Displaying 1-1 of 1 results found.

page 1

Primes p such that p-1 and p+1 have the same number of prime factors with multiplicity.

+0
1

5, 19, 29, 43, 67, 89, 151, 173, 197, 233, 271, 283, 307, 317, 349, 461, 491, 569, 571, 593, 653, 701, 739, 751, 787, 857, 859, 907, 919, 1013, 1061, 1097, 1277, 1291, 1303, 1483, 1667, 1747, 1831, 1867, 1889, 1913, 1973, 2003, 2083, 2131, 2311, 2357, 2393 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`19-1 = 233 has 3 factors. 19+1 = 225 has 3 factors. So 19 is in the table.`
	PROGRAM	`(PARI) g(n) = forprime(x=1, n, p1=bigomega(x-1); p2=bigomega(x+1); if(p1==p2, print1(x", ")))`
	CROSSREFS	`Sequence in context: A106062 A045456 A115167 this_sequence A045457 A138242 A122729` `Adjacent sequences: A115100 A115101 A115102 this_sequence A115104 A115105 A115106`
	KEYWORD	`easy,nonn`
	AUTHOR	`Cino Hilliard (hillcino368(AT)gmail.com), Mar 02 2006`

page 1

Search completed in 0.002 seconds

Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

AT&T Labs Research