A114991 Primes of the form 2^a * 3^b * 5^c + 1 for positive a, b, c.

31, 61, 151, 181, 241, 271, 541, 601, 751, 811, 1201, 1621, 1801, 2161, 2251, 3001, 4051, 4801, 4861, 6481, 7681, 8101, 8641, 9001, 9601, 9721, 11251, 14401, 15361, 19441, 21601, 21871, 22501, 23041, 24001, 32401, 33751, 36451, 37501, 43201, 54001, 57601, 58321

Offset

1,1

Links

T. D. Noe, Table of n, a(n) for n=1..1000

Example

a(1) = 31 = 2^1 * 3^1 * 5^1 + 1.
a(2) = 61 = 2^2 * 3^1 * 5^1 + 1.
a(3) = 151 = 2^1 * 3^1 * 5^2 + 1.
a(4) = 181 = 2^2 * 3^2 * 5^1 + 1.
Values include 30000001 = 2^7 * 3^1 * 5^7 + 1, 90000000001 = 2^9 * 3^2 * 5^9 + 1.

Crossrefs

Cf. A000040, A005109, A030430.

Cf. A143207.

Sequence in context: A132230 A136066 A282326 * A225874 A139892 A088464

Adjacent sequences: A114988 A114989 A114990 * A114992 A114993 A114994

Keyword

easy,nonn

Author

Jonathan Vos Post, Feb 22 2006

Status

approved