A075635 a(1) = 1 and then group the composite numbers so that the n-th group contains n numbers with a prime sum: (1), (4, 9), (6, 8, 15), (10, 12, 14, 25), (16, 18, 20, 21, 22), ...

1, 4, 9, 6, 8, 15, 10, 12, 14, 25, 16, 18, 20, 21, 22, 24, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 42, 40, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 69, 63, 64, 65, 66, 68, 70, 72, 74, 75, 84, 76, 77, 78, 80, 81, 82, 85, 86, 87, 88, 91, 90, 92, 93, 94, 95

Offset

1,2

Links

Table of n, a(n) for n=1..71.

Example

1; 4,9; 6,8,15; 10,12,14,25; 16,18,20,21,22; ...

Crossrefs

Cf. A075636, A075637, A075638.

Sequence in context: A199513 A360004 A236022 * A362213 A094243 A155875

Adjacent sequences: A075632 A075633 A075634 * A075636 A075637 A075638

Keyword

nonn,tabl

Author

Amarnath Murthy, Sep 30 2002

Extensions

More terms from David Wasserman, Jan 22 2005

Status

approved