A155953 Emirps of the form k^2 + k + 41.

71, 97, 113, 347, 743, 971, 1033, 1097, 1231, 1301, 1523, 1601, 1847, 1933, 3011, 3121, 3347, 3463, 7523, 9161, 9547, 9941, 10343, 12697, 13151, 15541, 15791, 17863, 30491, 31193, 32261, 32983, 39047, 70001, 72671, 74843, 75941, 77047, 79847

Offset

1,1

Links

Table of n, a(n) for n=1..39.

Formula

A005846 INTERSECTION A006567.

Maple

read("transforms") ; isA006567 := proc(n) local dr ; dr := digrev(n) ; RETURN(dr <> n and isprime(dr)) ; end: for n from 1 to 800 do p := n^2+n+41; if isprime(p) then if isA006567(p) then printf("%d, ", p) ; fi; fi; od: # R. J. Mathar, Feb 06 2009

Crossrefs

Cf. A005846, A006567, A155924.

Sequence in context: A134936 A118217 A023282 * A247200 A288907 A234962

Adjacent sequences: A155950 A155951 A155952 * A155954 A155955 A155956

Keyword

easy,nonn,base

Author

Jonathan Vos Post, Jan 31 2009

Extensions

Extended by R. J. Mathar and Dmitry Kamenetsky, Feb 06 2009

Status

approved