A214743 Least m>0 such that n-m divides prime(n)+prime(m).

1, 2, 1, 3, 1, 2, 1, 4, 2, 5, 2, 2, 4, 7, 2, 11, 2, 7, 6, 2, 8, 14, 18, 23, 14, 7, 12, 5, 8, 7, 22, 20, 10, 29, 23, 16, 4, 8, 4, 8, 14, 8, 4, 22, 9, 17, 19, 8, 12, 27, 30, 9, 16, 19, 24, 32, 9, 9, 36, 18, 14, 45, 24, 9, 2, 18, 32, 8, 14, 29, 26, 23, 19, 54, 44, 47, 24, 15, 20

Offset

2,2

Links

Clark Kimberling, Table of n, a(n) for n = 2..1000

Example

Write x#y if x|y is false; then 8#25, 7#26, 6#28, 5#30, so a(9) = 4.

Mathematica

Table[m = 1; While[! Divisible[Prime[n]+Prime[m], n-m], m++]; m, {n, 2, 100}]

Crossrefs

Cf. A214737.

Sequence in context: A286552 A324826 A277892 * A331179 A026100 A059127

Adjacent sequences: A214740 A214741 A214742 * A214744 A214745 A214746

Keyword

nonn,easy

Author

Clark Kimberling, Jul 28 2012

Status

approved