A108510 Primes p such that 3^A000027*(7*p) is a subsequence of A033631.

1979, 2699, 7649, 1131569, 2482199, 2886839, 90425537, 2774476799

Offset: 1

Author

Farideh Firoozbakht, Jun 07 2005

Keywords

• more
• nonn

Comments

There is no further term up to prime(300000000).

Examples

			Let n be a natural number and m=3^n*7*90425537;
then sigma(phi(m)) = sigma(3^(n-1)*2*6*90425536) = sigma(3^n*2^8*677*2087) = sigma(3^n)*8*90425538 = sigma(3^n)*sigma(7)*sigma(90425537) = sigma(3^n*7*90425537) = sigma(m),
hence m is in A033631 and the prime number 90425537 is a term of this sequence.
		

Crossrefs

Cf. A000027, A033631.