A201018 -id:A201018 - cp's OEIS frontend

A201017 Primes whose multiplicative digital root is 5.

5, 53, 151, 157, 359, 557, 571, 593, 751, 953, 1151, 1153, 1511, 1531, 1553, 1571, 1579, 1597, 1759, 3511, 3533, 5113, 5153, 5171, 5179, 5197, 5333, 5351, 5531, 5711, 5791, 7151, 7159, 7559, 7577, 7591, 7757, 7951, 9157, 11351, 11579, 11593, 11597, 11953

Offset: 1

Jaroslav Krizek, Nov 25 2011

Complement of A201018 with respect to A034052.

			Prime 157 is in the sequence because 1*5*7=35, 3*5=15, 1*5=5.

Eric Weisstein's World of Mathematics, Multiplicative Digital Root

Cf. A201018 (composite numbers whose multiplicative digital root is 5), A034052 (numbers whose multiplicative digital root is 5).

A201054 Composite numbers whose product of digits is 5.

Original entry on oeis.org

15, 51, 115, 511, 1115, 5111, 11115, 11151, 11511, 15111, 51111, 111115, 111151, 111511, 115111, 151111, 1111115, 1111511, 1115111, 1151111, 1511111, 5111111, 11111115, 11111151, 11111511, 11115111, 11151111, 11511111, 15111111, 51111111, 111111115, 111111151

Offset: 1

Jaroslav Krizek, Nov 26 2011

Complement of A107691 with respect to A199985. Subsequence of A201018 (composite numbers whose multiplicative digital root is 5).

			Number 115 is in sequence because 1*1*5=5.

Robert Israel, Table of n, a(n) for n = 1..10000

Cf. A107691 (primes whose product of digits is 5), A199985 (numbers whose product of digits is 5).

remove(isprime,[seq(seq((10^m-1)/9 + 4*10^j,j=0..m-1),m=1..10)]); # Robert Israel, Jan 03 2017

cp's OEIS Frontend

A201017 Primes whose multiplicative digital root is 5.

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