Least composite k such that phi(k+12n) = phi(k)+12n and sigma(k+12n) = sigma(k) + 12n where phi is the Euler totient function and sigma is the sum of divisors function.

A063519

Least composite k such that phi(k+12n) = phi(k)+12n and sigma(k+12n) = sigma(k) + 12n where phi is the Euler totient function and sigma is the sum of divisors function.

Terms

    a(0) =65a(1) =95a(2) =341a(3) =95a(4) =161a(5) =115a(6) =629a(7) =203a(8) =145a(9) =203a(10) =365a(11) =155a(12) =185a(13) =155a(14) =301a(15) =185a(16) =329a(17) =235a(18) =1541a(19) =287a(20) =185a(21) =287a(22) =413a(23) =205a(24) =329a(25) =215a(26) =469a(27) =215a(28) =905a(29) =371

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