A081988 Product of digits + 1 is a prime.

1, 2, 4, 6, 11, 12, 14, 16, 21, 22, 23, 25, 26, 28, 29, 32, 34, 36, 41, 43, 44, 47, 49, 52, 56, 58, 61, 62, 63, 65, 66, 67, 74, 76, 82, 85, 89, 92, 94, 98, 111, 112, 114, 116, 121, 122, 123, 125, 126, 128, 129, 132, 134, 136, 141, 143, 144, 147, 149, 152, 156, 158

Offset

1,2

Comments

Sequence is infinite: every number of the form 111..1 is in the sequence, for example. - Gabriel Cunningham (gcasey(AT)mit.edu), Apr 07 2003

Links

Michael S. Branicky, Table of n, a(n) for n = 1..10000

Example

126 is a member as 1*2*6 + 1 = 13 is a prime.

Crossrefs

Cf. A000042, A052382.

Sequence in context: A237277 A097954 A324333 * A244748 A245017 A300149

Adjacent sequences: A081985 A081986 A081987 * A081989 A081990 A081991

Keyword

base,easy,nonn

Author

Amarnath Murthy, Apr 04 2003

Extensions

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 06 2003

Offset changed and a(60) and beyond from Michael S. Branicky, Aug 22 2022

Status

approved