A160007 Deficient numbers more than 1 unit away from their predecessors.

7, 13, 19, 21, 25, 29, 31, 37, 41, 43, 49, 55, 57, 61, 67, 71, 73, 79, 81, 85, 89, 91, 97, 101, 103, 105, 109, 113, 115, 121, 127, 133, 139, 141, 145, 151, 157, 161, 163, 169, 175, 177, 181, 187, 193, 197, 199, 201, 205, 209, 211, 217, 221, 223, 225, 229, 235

Offset: 1

Author

Don Love (moptop35(AT)hotmail.com), Apr 29 2009

Keywords

• nonn

Examples

			The first dozen deficient numbers are 1,2,3,4,5,7,8,9,10,11,13,14. There are "jumps" between a(5) and a(6), and between a(10) and a(11), i.e., at 7 and 13.
		

Links

• Rainer Rosenthal, Table of n, a(n) for n = 1..2488

Crossrefs

Cf. A005100 (deficient numbers).

Cf. A353448.

Programs

PARI

lista(nn) = {last = 0; for (i = 1, nn, if (sigma(i) < 2*i, if (i > last + 1, print1(i, ", ");); last = i;););} \\ Michel Marcus, Sep 02 2013

Extensions

More terms from Don Love (moptop35(AT)hotmail.com), May 01 2009